Media playback is unsupported on your device Media caption The BBC's Khaled Ezzelarab: "The president seems to have lost control over the security forces" 
 
 Anti-government protesters in Egypt have stormed the national headquarters of President Mohammed Morsi's Muslim Brotherhood in the capital, Cairo. 
 
 People ransacked the building in the Moqattam area and set parts on fire. 
 
 Officials say eight people have been killed in clashes outside since Sunday, while eight others have died elsewhere. 
 
 Meanwhile, four ministers are reported to have resigned, a day after millions took to the streets across the country to demand the president leave power. 
 
 The al-Watan website said the ministers of tourism, environment, communication and legal affairs had acted "in solidarity with the people's demand to overthrow the regime". 
 
 On Monday afternoon, Egyptian state television reported the armed forces would issue a statement on the situation later in the day, but did not provide further details. 
 
 Earlier, the opposition movement behind the protests, Tamarod (Revolt), gave Mr Morsi until Tuesday afternoon to step down and call fresh presidential elections, or else face a campaign of civil disobedience. 
 
 Analysis All sides in Egypt were surprised by the huge scale of the demonstrations against the president. The opposition is a broad and informal coalition, which ranges from supporters of the old Mubarak regime to people who risked their lives to topple it. Their challenge is to find a way to sustain the momentum of Sunday's protests. President Morsi's spokesman has called for dialogue. For that to work, the president would have to offer major concessions, perhaps on a rewritten constitution. He showed no signs of conciliation during a major political speech last week, instead appealing to his Muslim Brotherhood base. As for the demonstrators, they have called for his resignation and early elections. Political chaos looks likely to continue. 
 
 Protesters across Egypt accuse the president of failing to tackle economic and security problems since being elected a year ago. His supporters insist he needs more time. 
 
 'Dangerous' 
 
 The crowds seen in Cairo's Tahrir Square on Sunday were the biggest since the 2011 revolution that toppled Hosni Mubarak. 
 
 Protests and sporadic outbreaks of violence were reported nationwide. 
 
 The health ministry said at least 16 people had been killed and 781 injured since Sunday. 
 
 Three people died in the central province of Assiut, and another four in Alexandria, Fayoum, Beni Suef and Kafr al-Sheikh. Another protester suffocated to death at a protest outside the Ittihadiya presidential palace in Cairo. 
 
 Eight people were killed in clashes around the Muslim Brotherhood's headquarters in Moqattam, the ministry added. 
 
 Overnight, protesters threw petrol bombs and rocks at armed guards inside the six-storey building, who retaliated by firing at them. 
 
 On Monday morning, the protesters stormed the headquarters and began throwing objects out of broken windows. One protester was seen removing parts of the signage, while another waved an Egyptian flag from a window. Later, people began walking out carrying office equipment. 
 
 Image caption Protesters ransacked the Cairo headquarters of President Mohammed Morsi's Muslim Brotherhood group early on Monday. Image caption Earlier, the Tamarod protest group gave Mr Morsi a day to leave step down, a year after he took office. Image caption The crowd in Tahrir Square on Sunday was the biggest since the revolution in 2011. Hundreds returned to the square on Monday. Image caption Many protesters spent the night on the streets of Cairo, including outside the Ittihadiya presidential palace. Image caption Protesters across Egypt have accused the president of failing to tackle economic and security problems. previous slide next slide 
 
 "This is a historic moment. The Brotherhood ruined the country, so stealing from them is justified," one man, named Mohammed, told the AFP news agency. 
 
 Many protesters accuse the president of putting the Brotherhood's interests ahead of the country's as a whole. 
 
 Brotherhood spokesman Gehad El-Haddad criticised the security forces for failing to protect the building and warned that the movement was considering action to defend itself. 
 
 "It's very dangerous for one entity in society to take up violence as a means of change because it may entice others to do so," he told the Reuters news agency. 
 
 Mr Haddad noted that self-defence committees had been set up during the 2011 uprising, and said the Brotherhood's Guidance Bureau would make an announcement later on Monday. 
 
 "The people will not sit silent," he added. 
 
 'Constitutional legitimacy' 
 
 Some protesters had spent the night camped out in Tahrir Square and also in front of the Ittihadiya presidential palace to the north-east. They vowed to stay there until the president stepped down. 
 
 One man heading to the palace was confident it would not take long. 
 
 Tamarod (Revolt) The Tamarod movement says more than 22 million people have signed a petition complaining that: Security has not been restored since the 2011 revolution that toppled Hosni Mubarak 
 
 The poor "have no place" in society 
 
 The government has had to "beg" the International Monetary Fund (IMF) for a $4.8bn loan to help shore up the public finances 
 
 There has been "no justice" for people killed by security forces during the uprising and at anti-government protests since then 
 
 "No dignity is left" for Egyptians or their country 
 
 The economy has "collapsed", with growth poor and inflation high 
 
 Egypt is "following in the footsteps" of the US Egypt deeply polarised as Morsi marks first year 
 
 "Mubarak took only 18 days although he had behind him the security, intelligence and a large sector of Egyptians," Amr Tawfeeq told the Associated Press. 
 
 Earlier, Tamarod issued a statement saying the protesters would give Mr Morsi until 17:00 (15:00 GMT) on Tuesday to leave power and allow state institutions to prepare for early presidential elections. 
 
 Otherwise, people would begin a campaign of "complete civil disobedience", the group warned. 
 
 It urged "state institutions including the army, the police and the judiciary, to clearly side with the popular will as represented by the crowds". 
 
 The group also rejected offers of dialogue from the president. 
 
 "There is no way to accept any half measures," it said. "There is no alternative other than the peaceful end of power of the Muslim Brotherhood and its representative, Mohammed Morsi." 
 
 On Saturday, Tamarod said it had collected more than 22 million signatures - more than a quarter of Egypt's population - in support. 
 
 But Mr Morsi was defiant in an interview published on Sunday, rejecting the opposition calls for early presidential elections. 
 
 "If we changed someone in office who [was elected] according to constitutional legitimacy - well, there will be people opposing the new president too, and a week or a month later they will ask him to step down," he told the Guardian newspaper. 
 
 "There is no room for any talk against this constitutional legitimacy. There can be demonstrations and people expressing their opinions. But what's critical in all this is the adoption and application of the constitution." ||||| Media playback is unsupported on your device Media caption The BBC's Aleem Maqbool in Tahrir Square says the size of the protest has been wholly unexpected 
 
 Huge protests across Egypt calling for the resignation of President Mohammed Morsi have taken place through the night, with some outbreaks of violence. 
 
 In the capital, Cairo, tens of thousands of people massed in Tahrir Square and outside the presidential palace in the biggest demonstration there since the 2011 revolution. 
 
 At least one person was killed in clashes at Cairo's headquarters of Mr Morsi's Muslim Brotherhood movement. 
 
 Four others died in clashes elsewhere. 
 
 Millions of protesters across the country accuse the country's first Islamist president of failing to tackle economic and security problems since taking power a year ago. 
 
 The most striking aspect of the protests in Alexandria is the variety of people here - veiled and non-veiled Mahmoud Abu Bakr, Alexandria Angry mood in provincial Egypt 
 
 The demonstration was largely peaceful, but some protesters later threw stones and petrol bombs at the Cairo headquarters of the Muslim Brotherhood. 
 
 At least one person was killed when shooting broke out near the political office, activists and a hospital official said. 
 
 Meanwhile, thousands of Mr Morsi supporters staged a rally in the Cairo suburb of Nasr City. 
 
 A presidential spokesman later urged the protesters to respect the democratic process, referring to Mr Morsi's victory in last year's elections which were widely seen as free and fair. 
 
 Analysis Many of those on the streets feel betrayed by a president who they say has been uninterested in uniting Egyptians despite once promising to be inclusive. They feel that he has instead governed purely in the interests of his own party. For his part, the president insists he has invited opposition groups to enter into dialogue but that they have not co-operated. His supporters say that whatever the considerable problems Egypt is facing, Mohammed Morsi must see out his full term in office for the sake of stability. Some pro-Morsi demonstrators have decided to stage their own sit-ins, and there are fears of clashes between opposing groups. The coming hours, and the way the situation is handled by the authorities, are likely to give us clear indications about whether or not Egypt's president can survive in office as he insists he will. 
 
 One clear achievement of President Morsi's opponents has been to get so many people out on to the streets, BBC's Middle East editor Jeremy Bowen reports from Cairo. 
 
 The last time such numbers were seen on the square was during the revolution in 2011 which saw the removal of President Hosni Mubarak from power. 
 
 The question they face now is how to fashion a political strategy that can rival the organisation of the Muslim Brotherhood, he says. 
 
 Another big question, he adds, is what the army will do. The defence minister has warned that the military may intervene if Egypt becomes ungovernable. 
 
 Society split 
 
 On Sunday, one man was killed and at least 24 injured in Beni Suef, 115km (71 miles) south of Cairo, security sources said. 
 
 According to a report on the Ahram news website, Morsi supporters attacked an opposition rally and unidentified gunmen opened fire. The report could not be confirmed independently. 
 
 Image copyright AFP Image caption A huge crowd of protesters stretched along an avenue near the presidential palace in Cairo on Sunday evening Image copyright Reuters Image caption Tahrir Square, focus of the uprising which ousted Hosni Mubarak, teemed with protesters Image copyright AP Image caption A protester in Cairo held a crossed-out photo of President Morsi framed with a tyre Image copyright AP Image caption In one picture police officers are seen in the middle of opposition supporters in Cairo Image copyright Reuters Image caption A big rally against Mr Morsi took place in Alexandria too Image copyright Reuters Image caption Alexandria was the scene of bloody fighting earlier this week previous slide next slide 
 
 In the southern city of Assiut, three people died and several were injured when shots were fired at protesters, reportedly by attackers on a motorcycle. 
 
 According to the health ministry, 253 people were injured across the country during Sunday's protests. 
 
 Mohammed Morsi's first year Image copyright AP June 2012 - Narrowly wins presidential election. Orders parliament to meet in defiance of a military decree dissolving it 
 
 Narrowly wins presidential election. Orders parliament to meet in defiance of a military decree dissolving it July 2012 - Submits to a Supreme Court ruling that the parliamentary elections were invalid 
 
 Submits to a Supreme Court ruling that the parliamentary elections were invalid August 2012 - Dismisses Defence Minister Hussein Tantawi and Chief of Staff Sami Annan, and strips military of say in legislation and drafting the new constitution 
 
 Dismisses Defence Minister Hussein Tantawi and Chief of Staff Sami Annan, and strips military of say in legislation and drafting the new constitution November 2012 - Rescinds a decree stripping the judiciary of the right to challenge his decisions, after popular protests 
 
 - Rescinds a decree stripping the judiciary of the right to challenge his decisions, after popular protests December 2012 - Public vote approves draft constitution boosting the role of Islam and restricting freedom of speech and assembly 
 
 Public vote approves draft constitution boosting the role of Islam and restricting freedom of speech and assembly March 2013 - Court halts his plans to bring parliamentary elections forward to April, citing failure to refer the electoral law to the Constitutional Court 
 
 Court halts his plans to bring parliamentary elections forward to April, citing failure to refer the electoral law to the Constitutional Court June 2013 - Puts Islamists in charge of 13 of Egypt's 27 governorships - controversially he appoints a member of the former armed group Gamaa Islamiya to be governor of Luxor Polarisation marks Morsi's first year Egyptian views of Morsi one year on Families torn by political divide 
 
 In Cairo, unidentified persons attacked the Muslim Brotherhood headquarters, which had been fortified with sandbags earlier. Staff inside said they had not broken in, Reuters news agency reports. 
 
 Demonstrations were also held in Alexandria, Port Said, Suez and other cities. 
 
 Presidential spokesman Ihab Fahmi called on all Egyptians to "unite and listen to the sound of wisdom". 
 
 "Political diversity necessitates on all parties to abide by the democratic process," he said. 
 
 And he reiterated that President Morsi was open to a "real and serious national dialogue". 
 
 As darkness fell, the opposition National Salvation Front (NSF) released what it called "Revolution Statement 1", calling on protesters across Egypt to "maintain their peaceful [rallies] in all the squares and streets and villages and hamlets of the country... until the last of this dictatorial regime falls". 
 
 The NSF is among liberal and secular opposition groups which have endorsed a petition organised by the grassroots movement Tamarod (Rebellion), which calls for a snap election. Opposition activists say more than 22 million people have signed it. 
 
 There was also some evidence of anti-American and anti-Israeli feeling among the protesters, with one flag portraying President Morsi inside a Star of David. 
 
 The BBC's Aleem Maqbool in Cairo says many ordinary Egyptians - angered by Mr Morsi's political and economic policies - have been taking part in the rally in Tahrir Square. 
 
 At one point, army helicopters flew over Tahrir Square and dropped Egyptian flags, to cheers from the anti-Morsi crowd, he says. 
 
 Mr Morsi, who hails from the Muslim Brotherhood, became president on 30 June 2012. 
 
 His first year as president has been marred by constant political unrest and a sinking economy. ||||| Egyptian protesters chant slogans and wave national flags in Tahrir Square, the focal point of Egyptian uprising, in Cairo Sunday, June 30, 2013. Thousands of opponents and supporters of Egypt's Islamist... (Associated Press) 
 
 Tens of thousands of opponents of Egypt's Islamist president massed in Cairo's Tahrir Square and in cities around the country Sunday, launching an all-out push to force Mohammed Morsi from office on the one-year anniversary of his inauguration. Fears of violence were high, with Morsi's Islamist supporters vowing to defend him. 
 
 Waving Egyptian flags, crowds packed Tahrir, the birthplace of the 2011 uprising that toppled autocrat Hosni Mubarak, and chants of "erhal!", or "leave!" rang out. 
 
 On the other side of Cairo, thousands of Islamists gathered in a show of support for Morsi outside the Rabia al-Adawiya Mosque near the Ittihadiya presidential palace, which the opposition planned to march on in the evening. Some Morsi backers wore homemade body armor and construction helmets and carried shields and clubs _ precautions, they said, against possible violence. 
 
 There is a sense among opponents and supporters of Morsi that Sunday is a make-or-break day, hiking worries that the two camps will come to blows, even as each side insists it won't start violence. Already at least seven people, including an American, have been killed in clashes the past week, mainly in Nile Delta cities and the coastal city of Alexandria. 
 
 The demonstrations are the culmination of polarization and instability that have been building since Morsi's June 30, 2012 inauguration as Egypt's first freely elected leader. The past year has seen multiple political crises, bouts of bloody clashes and a steadily worsening economy, with power outages, fuel shortages, rising prices and persistent lawlessness and crime. 
 
 In one camp are the president and his Islamist allies, including the Muslim Brotherhood and more hard-line groups. They say street demonstrations cannot be allowed to remove a leader who won a legitimate election, and they accuse Mubarak loyalists of being behind the campaign in a bid to return to power. They have argued that for the past year remnants of the old regime have been sabotaging Morsi's attempts to deal with the nation's woes and bring reforms. 
 
 Hard-liners among them have also given the confrontation a sharply religious tone, denouncing Morsi's opponents as "enemies of God" and infidels. 
 
 On the other side is an array of secular and liberal Egyptians, moderate Muslims, Christians _ and what the opposition says is a broad sector of the general public that has turned against the Islamists. They say the Islamists have negated their election mandate by trying to monopolize power, infusing government with their supporters, forcing through a constitution they largely wrote and giving religious extremists a free hand, all while failing to manage the country. 
 
 The opposition believes that with sheer numbers in the street, it can pressure Morsi to step down _ perhaps with the added weight of the powerful military if it signals the president should go. 
 
 "Today is the Brotherhood's last day in power," predicted Suliman Mohammed, a manager of a seafood company who was protesting at Tahrir, where crowds neared 100,000 by early afternoon. 
 
 "I came here today because Morsi did not accomplish any of the (2011) revolution's goals. I don't need anything for myself, but the needs of the poor were not met." 
 
 Another Tahrir protester, 21-year-old Mohammed Abdel-Salam, said he came out because he wanted early presidential elections. "If he is so sure of his popularity why doesn't he want to organize early elections? If he wins it, we will tell the opposition to shut up." 
 
 Underlining the potential for deadly violence, a flurry of police reports on Sunday spoke of the seizure of firearms, explosives and even artillery shells in various locations of the country, including Alexandria and the outskirts of Cairo. Sunday afternoon, two offices belonging to the Brotherhood's Freedom and Justice party, were attacked and ransacked Sunday by protesters in the city of Bani Suef, south of Cairo. 
 
 In an interview published Sunday in The Guardian, Morsi _ who has three years left in his term _ said he had no plans to meet the protesters' demand for an early presidential election. 
 
 "If we changed someone in office who (was elected) according to constitutional legitimacy _ well, there will (be) people or opponents opposing the new president too, and a week or a month later, they will ask him to step down," Morsi told the British daily. 
 
 "There is no room for any talk against this constitutional legitimacy," he said. 
 
 Traffic in Cairo's normally clogged streets was light at midday as many residents chose to stay home for fear of violence or a wave of crime similar to the one that swept Egypt during the 18-day, anti-Mubarak uprising. Banks were closing early and most government departments were either closed for the day or were thinly staffed. Most schools and colleges are already closed for the summer holidays. 
 
 The opposition protests emerge from a petition campaign by a youth activist group known as Tamarod, Arabic for "Rebel." For several months, the group has been collecting signatures on a call for Morsi to step down. 
 
 On Saturday the group announced it had more than 22 million signatures _ proof, it claims, that a broad sector of the public no longer wants Morsi in office. 
 
 It was not possible to verify the claim. If true, it would be nearly twice the around 13 million people who voted for Morsi in last year's presidential run-off election, which he won with around 52 percent of the vote. Tamarod organizers said they discarded about 100,000 signed forms because they were duplicates. 
 
 Morsi's supporters have questioned the authenticity and validity of the signatures, but have produced no evidence of fraud. 
 
 Adding to his troubles, eight lawmakers from the country's interim legislature announced their resignation Saturday to protest Morsi's policies. The 270-seat chamber was elected early last year by less than 10 percent of Egypt's eligible voters, and is dominated by Islamists. 
 
 A legal adviser to Morsi also announced his resignation late Saturday in protest of what he said was Morsi's insult of judges in his latest speech on Wednesday. 
 
 A week ago, with the public sense of worry growing over the upcoming confrontation, Defense Minister Gen. Abdel-Fattah el-Sissi last week gave the president and his opponents a week to reach a compromise. He warned that the military would intervene to prevent the nation from entering a "dark tunnel." 
 
 Army troops backed by armored vehicles were deployed Sunday in some of Cairo's suburbs, with soldiers, some in combat gear, stood at traffic lights and major intersections. Army helicopters flew over Cairo on several occasions on Sunday, adding to the day's sense of foreboding. 
 
 Morsi had called for national reconciliation talks in a Wednesday speech but offered no specifics. Opposition leaders dismissed the call as cosmetics. 
 
 Asked by The Guardian whether he was confident that the army would not intervene if the country becomes ungovernable, Morsi replied, "Very." 
 
 The Egyptian leader, however, said he did not know in advance of el-Sissi's comments last week. 
 
 ____ 
 
 Associated Press reporter Tony G. Gabriel contributed to this report.
– Officials say three anti-government protesters have been killed in the southern Egyptian city of Assiut, after suspected Islamists riding a motorbike fired on protesters outside a local government building. One was killed and seven injured, prompting protesters to march on the local office of the Muslim Brotherhood's Freedom and Justice party, where at least two more were shot by gunmen inside the building, the AP reports. Another protester was killed outside Freedom and Justice party headquarters in Beni Suef. The country is gripped with anti-government protests today, with hundreds of thousands massing in Cairo's Tahrir Square and other cities around the country to call for the removal of President Mohamed Morsi, the AP reports. "Today is the Brotherhood's last day in power," says one protestor at Tahrir. "I came here today because Morsi did not accomplish any of the [2011] revolution's goals ... the needs of the poor were not met." But Morsi, who has three years left in office, remains defiant in the face of growing opposition and calls for an early election. "If we changed someone in office who [was elected] according to constitutional legitimacy—well, there will be people opposing the new president too, and a week or a month later they will ask him to step down," he told the Guardian.