FILE -- In this July 5, 2013 file photo, worshippers visit the Prophet's Mosque in Medina, Saudi Arabia. State-linked Saudi news websites reported an explosion has gone off outside the Prophet's Mosque,... (Associated Press) 
 
 FILE -- In this July 5, 2013 file photo, worshippers visit the Prophet's Mosque in Medina, Saudi Arabia. State-linked Saudi news websites reported an explosion has gone off outside the Prophet's Mosque, one of Islam's holiest sites in the city of Medina on Monday, July 4, 2016, the same day that two... (Associated Press) 
 
 DUBAI, United Arab Emirates (AP) — State-linked Saudi news websites reported an explosion Monday near one of Islam's holiest sites in the city of Medina, as two suicide bombers struck in different cities without killing anyone. 
 
 Sabq news site and other local media, quoting unnamed sources, said the explosion was caused by a suicide bomber near a security building outside the Prophet Muhammad's mosque. Several cars caught fire. Local media showed images of what appeared to be a fire outside one of the buildings overlooking the Prophet's Mosque. It was not immediately clear if anyone was killed or wounded in the blast. 
 
 The sprawling mosque where the Prophet Muhammad is buried is visited by millions of Muslims from around the world each year during pilgrimages to Mecca. The area would have been packed with pilgrims for prayer during the final days of the Muslim holy month of Ramadan, which ends in the kingdom on Tuesday. 
 
 The Interior Ministry could not immediately be reached for comment. 
 
 Qari Ziyaad Patel, 36, from Johannesburg, South Africa, was at the mosque when he heard a blast just as the call to sunset prayers was ending. People were breaking their fast with dates so the mood was subdued, he said. Many at first thought it was the sound of traditional, celebratory cannon fire, but then he felt the ground shake. 
 
 "The vibrations were very strong," he said. "It sounded like a building imploded." 
 
 Also Monday evening, a suicide bomber and a car bomb exploded near a Shiite mosque in eastern Saudi Arabia, according to a resident there, several hours after another suicide bomber carried out an attack near the U.S. Consulate in the western city of Jiddah. 
 
 The possibility of coordinated, multiple attacks across different cities in Saudi Arabia on the same day underscores the threat the kingdom faces from extremists who view the Western-allied Saudi monarchy as heretics and enemies of Islam. Saudi Arabia is part of the U.S.-led coalition fighting the Islamic State group in Iraq and Syria. 
 
 The attack in the eastern region of Qatif did not appear to cause any injuries, said resident Mohammed al-Nimr, whose brother is Nimr-al-Nimr, a prominent Saudi Shiite cleric executed in January. He told The Associated Press the bomber detonated his suicide vest when most residents of the neighborhood were at home breaking the daily Ramadan fast. 
 
 Qatif is heavily populated by Shiites, who are a minority in the Sunni-ruled kingdom. Al-Nimr said that near the body of a suicide bomber was a car bomb that also went off around the same time. 
 
 The IS group's local affiliates in the kingdom have previously attacked Shiite places of worship, including an attack on a Shiite mosque in Qatif in May 2015 that killed 21 people. 
 
 Earlier Monday, the Interior Ministry said a suicide bomber had detonated his explosives when security guards approached him near the U.S. Consulate in Jiddah. The attacker died and the two security men were lightly wounded, according to the ministry statement, which was published by the state-run Saudi Press Agency. Some cars in the parking lot were damaged. 
 
 Interior Ministry spokesman Maj. Gen. Mansour al-Turki was quoted in the statement as saying the guards noticed the man was acting suspiciously at an intersection on the corner of the heavily fortified consulate, near a hospital and a mosque. 
 
 The U.S. Embassy in Saudi Arabia confirmed there were no casualties among consular staff, and said it remains in contact with Saudi authorities as they investigate. 
 
 No one immediately claimed responsibility for the attack. 
 
 The Interior Ministry did not say whether the bomber intended to target the U.S. diplomatic compound, adding that an investigation is underway to determine his identity. 
 
 The state-run news channel al-Ekhbariya, quoting the Interior Ministry, said the bomber was not a Saudi citizen, but a resident of the kingdom. It gave no further details on his nationality. There are around 9 million foreigners living in Saudi Arabia, which has a total population of 30 million. 
 
 Footage aired on the channel after the attack showed crime scene investigators and police casing the area for evidence and dusting for fingerprints. Al-Ekhbariya said security forces detonated six explosive devices found at the scene. 
 
 A 2004 al-Qaida-linked militant attack on the U.S. Consulate in Jiddah killed five locally hired consular employees and four gunmen. The three-hour battle at the compound came amid a wave of al-Qaida attacks targeting Westerners and Saudi security posts. 
 
 More recently, Saudi Arabia has been a target of Islamic State attacks that have killed dozens of people. In June, the Interior Ministry reported 26 terror attacks in the kingdom in the last two years. 
 
 The U.S. Embassy regularly issues advisory messages for U.S. citizens in Saudi Arabia. In a message issued Sunday and another one issued after the attack Monday, the embassy urged Americans to "remain aware of their surroundings, and take extra precautions when travelling throughout the country." It also advised citizens to "carefully consider the risks of traveling to Saudi Arabia." 
 
 In neighboring Kuwait on Monday, security forces said they had arrested several suspects with alleged ties to IS, including an 18-year-old man who was planning to attack a Shiite mosque in the final days of Ramadan. Officials did not say when the arrests took place. An IS affiliate claimed responsibility for a suicide bombing carried out by a Saudi man last year in one of Kuwait's oldest Shiite mosques. That attack killed 27 people. 
 
 ___ 
 
 Associated Press writer Adam Schreck contributed to this report. ||||| GENEVA/DUBAI (Reuters) - The king of Saudi Arabia warned his country would strike with an “iron hand” against people who preyed on youth vulnerable to religious extremism, a day after suicide bombers struck three cities in an apparently coordinated campaign of attacks. 
 
 In a speech marking Eid al-Fitr, the holiday that celebrates the end of the Islamic holy month of Ramadan, King Salman said a major challenge facing Saudi Arabia was preserving hope for youth who faced the risk of radicalization. 
 
 “We will strike with an iron hand those who target the minds and thoughts... of our dear youth,” Salman, 80, said. 
 
 Four security officers were killed in Monday’s attacks that targeted U.S. diplomats, Shi’ite Muslim worshippers and a security headquarters at a mosque in the holy city of Medina. The attacks all seem to have been timed to coincide with the approach of the Islamic Eid holiday. 
 
 The U.N. human rights chief on Tuesday described the bombing outside the Prophet Mohammed’s Mosque in Medina as “an attack on Islam itself” and many Muslims expressed shock that their second-holiest site had been targeted. 
 
 No group has claimed responsibility but Islamic State militants have carried out similar bombings in the U.S.-allied, Sunni Muslim-ruled kingdom in the past year, targeting minority Shi’ites and Saudi security forces. 
 
 Zeid Ra’ad al-Hussein, the U.N. High Commissioner for Human Rights and a member of the Jordanian royal family, delivered his remarks via a spokesman in Geneva. 
 
 “This is one of the holiest sites in Islam, and for such an attack to take place there, during Ramadan, can be considered a direct attack on Muslims all across the world,” he said. “It is an attack on the religion itself.” 
 
 ATTACK UNNERVES SAUDIS 
 
 Militant attacks on Medina are unprecedented. The city is home to the second most sacred site in Islam, a mosque built in the 7th century by the Prophet Mohammed, the founder of Islam, which also houses his tomb. 
 
 Muslim worshippers gather after a suicide bomber detonated a device near the security headquarters of the Prophet's Mosque in Medina, Saudi Arabia, July 4, 2016. REUTERS/Handout 
 
 Attacks on Mecca, the holiest place in Islam, have been extremely rare. The Al Saud ruling family considers itself the protectors of both sites. Islamic State says the Saudi rulers are apostates and has declared its intention to topple them. 
 
 Saudis were rattled by the rare, high-profile attack. 
 
 “I apologize to everyone if I don’t congratulate you this Eid,” Khaled bin Saleh al-Shathri, a Saudi businessman, wrote on Twitter. “I am shocked by the deaths of five of my brothers and the wounding of four others as they guarded the holiest places.” 
 
 Iran, the region’s major Shi’ite power, also condemned the attacks. 
 
 Saudi Arabia’s crown prince and anti-terror tsar, Mohammed bin Nayef bin Abdul-Aziz, sought on Tuesday to reassure Saudis of the country’s security. 
 
 “The security of the homeland is good, it is at its highest levels and thanks be to God it gets stronger every day,” the state news agency SPA quoted him as saying during a visit to some of the wounded in the Jeddah attack. 
 
 Slideshow (3 Images) 
 
 Prince Mohammed has been credited for ending a bombing campaign by al Qaeda in Saudi Arabia between 2003 and 2006. 
 
 Monday’s bombings happened days before the end of Ramadan, when Muslims fast from dawn until dusk. 
 
 Saudi security officials say Islamic State’s supporters inside the kingdom mainly act independently from the group in Iraq and Syria, its main areas of operations. 
 
 Salah al-Budair, the imam of the Prophet’s Mosque, warned young people about being lured by the “malignant” ideology of Islamic State. “(The bomber) is an infidel who has sold himself to the enemies of his religion and his country,” he said.
– Yet more high-profile terror attacks: Suicide bombers struck three cities in Saudi Arabia on Sunday, including in Medina near one of the holiest sites in Islam. In the latter incident, the explosion took place outside the mosque where the Prophet Muhammad is buried, reports AP. Several cars caught fire, and local media showed images of what appeared to be a fire outside one of the buildings overlooking the Prophet's Mosque. The number of casualties was unclear, though Reuters reports three bombers and two security forces officers were killed. The sprawling mosque is visited by millions of Muslims from around the world each year during pilgrimages to Mecca. The area would have been packed with pilgrims for prayer during the final days of the Muslim holy month of Ramadan, which ends in the kingdom on Tuesday. Also Monday evening, a suicide bomber and a car bomb exploded near a Shiite mosque in eastern Saudi Arabia, several hours after another suicide bomber carried out an attack near the US Consulate in the western city of Jiddah. Neither of those two attacks killed anyone but the bombers. The possibility of coordinated, multiple attacks across different cities in Saudi Arabia on the same day underscores the threat the kingdom faces from extremists who view the Western-allied Saudi monarchy as heretics and enemies of Islam. Saudi Arabia is part of the US-led coalition fighting the Islamic State group in Iraq and Syria. The violence follows attacks in Iraq, Bangladesh, and Turkey.