As Manchester paid tribute last night to the victims of Monday's suicide bombing, so did the rest of the world.

22 people were killed and 64 injured in the attack, which took place at the end of US pop star Ariana Grande's concert at the Manchester Arena.

Replicating previous tributes following terror attacks, iconic monuments in Europe and across the globe were illuminated with the Union Jack, in solidarity with Manchester.

Here's how the world reacted to Monday's terror attack:</s>Manchester attack: Three men arrested in connection with bombing

Three men have been arrested in connection with the Manchester concert bombing.

A total of four people have now been arrested as part of the inquiry into the atrocity, which left 22 people dead and dozens more injured.

The military will be providing armed guards for key locations across London including Buckingham Palace, Downing Street, the Palace of Westminster and embassies after the terror threat level was raised to critical.

Here is what we know so far:
• The attack was carried out by a lone male suicide bomber, identified as 22-year-old Salman Abedi, as people left a concert by American singer Ariana Grande at Manchester Arena
• Twenty of the injured remain in "critical care"
• Security services are investigating whether he acted alone or was part of a network
• So-called Islamic State have claimed they are behind the attack
• A vigil was held on Tuesday in Manchester's Albert Square</s>Manchester attack: Soldiers to be deployed at key locations

Britain is on critical terror alert with military troops set to bolster police forces amid fears Manchester attacker Salman Abedi did not act alone.

The military will be providing armed guards for key locations across London including Buckingham Palace, Downing Street, the Palace of Westminster and embassies.

The announcement comes in the wake of the Manchester attack on Monday night, which killed 22 people, including children, and injured 59.

Here is what we know so far:
• The attack was carried out by a lone male suicide bomber, identified as 22-year-old Salman Abedi, as people left a concert by American singer Ariana Grande at Manchester Arena
• Twenty of the injured remain in "critical care"
• Security services are investigating whether he acted alone or was part of a network
• A 23-year-old has been arrested in south Manchester in connection with the incident
• So-called Islamic State have claimed they are behind the attack
• A vigil was held on Tuesday in Manchester's Albert Square</s>MANCHESTER/LONDON, May 23 (Reuters) - The suspected suicide bomber who killed 22 people at a concert in Manchester, northern England, on Monday has been identified as 22-year-old Salman Abedi, British police said.

Abedi was born in Manchester in 1994 to parents of Libyan birth, U.S. security officials said, citing British intelligence officials.

His parents emigrated from Libya to London before moving to the Fallowfield area of south Manchester, where they have lived for at least 10 years, the officials said.

Police raided a house in Elsmore Road in Fallowfield earlier on Tuesday.

A 23-year-old man arrested by police in a separate move in south Manchester in connection with the attack on Tuesday was believed to be Abedi's brother, news reports said.

Abedi had a sister named Jomana Abedi, the U.S. security officials said. (Reporting by Reuters correspondents in Manchester, London and Washington; Writing by Paul Sandle; Editing by William Schomberg)</s>British police on Tuesday named the suspected attacker behind the Manchester concert bombing that killed 22 people as Salman Abedi, but declined to give any further details.

The 22-year-old “has not yet been formally identified and I wouldn’t wish, therefore, to comment further”, said Chief Constable Ian Hopkins of the Greater Manchester Police force.

“The priority remains to establish whether he was acting alone or as part of a network,” he added.

According to the Daily Telegraph newspaper, Abedi was born in Manchester to Libyan parents, who fled their country to escape the regime of former dictator Moamer Khadafi.

The family have lived in the Fallowfield area of south Manchester for at least 10 years, it said. Police on Tuesday raided an address in the area, carrying out a controlled explosion to gain entry.

The suspected attacker’s father is known by the honorific Abu Ismael in the Libyan community and worked as an odd-job man in Manchester, according to The Guardian, but is thought to be currently in Tripoli.

“Abu Ismael will be terribly distraught,” one man who knew him told the newspaper.

“He was always very confrontational with jihadi ideology, and this ISIS thing isn’t even jihad, it’s criminality. The family will be devastated,” the man said.

A 23-year-old man was arrested earlier Tuesday in connection with the attack, while a house was raided in the Whalley Range area, also in south Manchester.

“We understand that feelings are very raw right now and people are bound to be looking for answers,” Hopkins, the chief constable, added.

“However, now, more than ever, it is vital that our diverse communities in Greater Manchester stand together and do not tolerate hate.”

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Also, Like us on facebook</s>Prime Minister Theresa May announced late Tuesday that the U.K.'s terrorism threat level had been raised to "critical" after Salman Abedi killed 22 people in a suicide bombing in Manchester.

MANCHESTER, England—Armed soldiers deployed at British landmarks on Wednesday, as the country’s top security official said it ”seems likely” that the man who killed 22 people, among them children, in an attack at a concert in Manchester didn’t act alone.

Police arrested three more men as part of their investigation into the suicide bombing at an Ariana Grande pop concert, the deadliest attack in the U.K. since 2005. That brings the...</s>Britain raised its terror alert to the highest level on Tuesday, a day after 22 people were killed by a suicide-bomber at a Manchester concert. Authorities are investigating whether the suspect had accomplices and the extent of any terrorist links.

In a televised statement from her Downing Street office, Prime Minister Theresa May announced late Tuesday that the threat level had been raised from “severe” to “critical”, meaning an attack may be imminent, for the first time since June 2007.

Police say a lone male suicide-bomber detonated a homemade bomb in the foyer of Manchester Arena around 10:30pm on Monday as crowds were leaving a concert by US pop star Ariana Grande. Many of the victims were young fans (the youngest identified so far was 8 years old) as well as parents picking up their children. Another 59 people were injured in the explosion, 20 of them critically.

Metal nuts and bolts were seen strewn around the arena floor among the bodies, witnesses said.

Authorities have identified the perpetrator as Salman Abedi, 22, a Manchester-born man of Libyan descent. Abedi died at the scene.

Police raided a property on Elsmore Road in the Fallowfield area of Manchester, one of several addresses where the Abedi family is thought to have lived, on Tuesday night. BBC home editor Mark Easton said the area is known to have been home to Islamist extremists in recent years, some with links to Libya or Syria.

Abedi’s parents have since repatriated to Libya and Abedi himself returned to the UK from the country in just the last few days, the Times of London reported, citing a friend of Abedi’s.

But British Interior Minister Amber Rudd said on Wednesday that the attack may have been the work of more than one person.

"It was a devastating occasion, it was more sophisticated than some of the attacks we've seen before, and it seems likely – possible – that he wasn't doing this on his own," she told BBC radio.

Three men were arrested Wednesday in Manchester in connection with the attack. A 23-year-old man was also arrested on Tuesday.

Rudd, who has been making the rounds on British media in the aftermath of the attack, confirmed that Abedi was known to the security services but was not considered high priority.

"We do know that he was known up to a point to the intelligence services," she told Sky News.

Rudd said she was "not surprised at all" that the attack had been claimed by the Islamic State group, but emphasised that authorities could not yet confirm the extent of the jihadist group’s involvement.

French Interior Minister Gérard Collomb spoke with May soon after the attack. He told France’s BFM TV on Wednesday that Abedi is believed to have travelled to Syria and that he had "proven" links with the Islamic State group but did not elaborate.

Abedi’s father sometimes did the call to prayer at Manchester’s Didsbury mosque, where Salman worshipped and where his older brother was a tutor at its Koran school.

Mohammed Saeed El-Saeiti, the Didsbury mosque’s imam, said Abedi had showed signs of having been radicalised.

“Salman showed me the face of hate after my speech on ISIS,” the imam told the Daily Telegraph. “He used to show me the face of hate and I could tell this person does not like me. It’s not a surprise to me.”

The Manchester Islamic Centre and Didsbury Mosque condemned Monday’s “horrific incident”. “The thoughts and prayers of Manchester Islamic Centre is with the victims, their families, their friends and the Manchester community as a whole,” the mosque said in a statement on its website.

The army is being deployed to help guard key landmarks, including Buckingham Palace, Downing Street, the Houses of Parliament and foreign embassies. Up to 3,800 soldiers will be deployed as part of Operation Temperer, which takes effect on Wednesday.

The British public can expect to see an increased police presence in major cities. The UK Parliament has said that all public events and tours have been cancelled until further notice. Many of the security operations taking place in the aftermath of the attack will be taking place behind the scenes, however.

"Whilst some of what we are doing will be obvious to the public there is a huge amount of work happening day and night that the public will never know about," said Commander Jane Connors, who is leading the London police operation.

The Manchester attack was the deadliest in Britain since July 2005, when four British Muslim suicide bombers killed 52 people in coordinated attacks on London's transport network.

BBC home affairs correspondent Dominic Casciani said that the big question now for British investigators is to determine how Abedi came by the explosive device he used in the bombing: whether he taught himself how to make it, whether someone showed him how or whether the device was provided to him.

These are “sophisticated devices” that require some skill in engineering, Casciani noted in an article Tuesday.

He pointed out that both Islamic State group militants and al Qaeda-linked groups have constructed devices that used metal nuts and bolts to maximise the damage from shrapnel, as has been reported from the Manchester Arena scene.

At the Thames House headquarters of MI5, officers supported by the UK's surveillance agency, the GCHQ, and foreign intelligence agencies will be examining the evidence to get a sense of the attacker and those around him. Meanwhile, Britain’s national Forensic Explosives Laboratory in Kent is undertaking the difficult work of piecing together the remains of the device to reconstruct it, Casciani said.

“It may take months for the full picture to emerge,” he said.</s>Officials identified 22-year-old Salman Abedi as the suicide bomber in Monday night’s deadly attack at the Ariana Grande concert in Manchester, England. He was previously known to British authorities, CBS News reported. USA TODAY</s>The suicide bomber who killed 22 people and injured dozens more at the Manchester Arena has been named as 22-year-old Salman Abedi, according to US officials.

Born in Manchester in 1994, the second youngest of four children his parents were Libyan refugees who came to the UK to escape the Gaddafi regime.

His mother, Samia Tabbal, 50, and father, Ramadan Abedi, a security officer, were both born in Libya but appear to have emigrated to London before moving to the Fallowfield area of south Manchester where they have lived for at least ten years.

After giving birth to two sons, they had son Hashem Abedi, now 20, and daughter Jomana, 18.

Jomana, who has two Facebook profiles, attended Whalley Range High School before apparently working at Didsbury Mosque in 2013.

Although born in Manchester, she states online that she is from Tripoli and has many Libyan connections. Her profile also makes reference to wearing a hijab.

Abedi grew up in the Whalley Range area, just yards from the local girl's high school, which hit the headlines in 2015 when twins and grade A pupils, Zahra and Salma Halane, who were both aspiring medical students, left their homes and moved to Isil controlled Syria.

There were unconfirmed reports in Manchester that the whole family apart from the two elder sons recently returned to Libya.</s>Image caption Eight-year-old Saffie Roussos and Georgina Callander are among the dead

Salman Abedi has been named by police as the suspected suicide bomber who killed 22 people and injured 59 at Manchester Arena on Monday night.

The 22-year-old was born in Manchester to parents of Libyan descent, the BBC understands.

Three of his victims have been named - Saffie Rose Roussos, eight, Georgina Callander and John Atkinson, 28.

Greater Manchester Police said the priority was to establish whether Abedi had worked alone or not.

The former Salford University student is thought to have blown himself up in the arena's foyer shortly after 22:30 BST on Monday, as fans were beginning to leave a concert by US singer Ariana Grande.

A vigil for the dead and injured was held in front of the town hall in Manchester's Albert Square on Tuesday evening.

Earlier, Greater Manchester Police Chief Constable Ian Hopkins passed on "heartfelt sympathies to all the innocent people caught up in last night's despicable act", adding that specially trained officers were supporting families.

Image caption John Atkinson was the third victim named

Eight-year-old Saffie Rose Roussos was a pupil at Tarleton Primary School, in Lancashire.

Her head teacher, Chris Upton, said she had been "simply a beautiful little girl in every aspect of the word" and was "loved by everyone".

John Atkinson was from Bury, Greater Manchester.

Student Georgina Callander, believed to have been 18, had been studying health and social care at Runshaw College in Leyland, Lancashire.

The wounded, who include 12 children aged under 16, are being treated at eight hospitals across Manchester.

Several people are still missing, including Eilidh MacLeod, 14, from Barra in the Outer Hebrides, 15-year-old Olivia Campbell, Chloe Rutherford, 17, and Liam Curry, 19.

Eilidh's friend, Laura MacIntyre, 15 - who was also reported as missing - was later identified as one of the seriously injured in a Manchester hospital.

Vigil interrupted

Thousands of people turned out for the vigil in Manchester and to hold a minute's silence to remember those who died.

Home Secretary Amber Rudd, Labour leader Jeremy Corbyn and Commons Speaker John Bercow stood on stage alongside Manchester Mayor Andy Burnham and Greater Manchester Police Chief Constable Ian Hopkins.

Vigils have been held elsewhere, including in Birmingham, where the event was interrupted after a man apparently armed with a large knife and a baseball bat was detained nearby.

Image copyright PA Image caption Thousands of people gathered at a vigil in central Manchester on Tuesday evening

In other developments:

Relatives are using social media to hunt for missing loved ones, and an emergency number - 0800 096 0095 - has been set up

- has been set up Flags are flying at half mast outside Number 10 and political parties have suspended general election campaigning until further notice

The prime minister and the Labour leader both signed the book of condolence at Manchester's Town Hall

Extra armed officers will be deployed to Wembley and Twickenham at the weekend, while security at all upcoming events and venues in England is under review.

World leaders have expressed solidarity with the UK, including US President Donald Trump, who called those behind the attack "evil losers"

Exam boards are telling schools directly affected by the attack that they can re-arrange GCSE and A-level exams in the wake of the attack

Police have established a help centre at Manchester City's Etihad Stadium, access Gate 11, for anyone who needs assistance in tracing loved ones

The Queen extended her "deepest sympathy" to all those affected; Pope Francis offered "heartfelt solidarity" with the victims and their families

Take That are among a number a performers who have cancelled concerts "out of respect". They have cancelled four shows this week, including three in Manchester

Media playback is unsupported on your device Media caption Theresa May says the Manchester attack was an act of 'sickening cowardice'

In a statement in Downing Street on Tuesday, the prime minister said the bombing had been a "callous terrorist attack" that targeted "defenceless young people".

Number 10 later said Mrs May, who visited a children's hospital in Manchester, had been updated throughout Monday night and had phoned Labour leader Jeremy Corbyn at 04:00 BST to brief him.

The arena bombing is the worst terrorist attack in the UK since the 7 July bombings in 2005, in which 52 people were killed by four suicide bombers.

So-called Islamic State has said - via IS channels on the messaging app Telegram - it was behind the Manchester attack, but this has not been verified.

The director general of the security service MI5, Andrew Parker, condemned the terrorist attack as "disgusting" and said the security service remained "relentlessly focused, in numerous current operations, on doing all we can to combat the scourge of terrorism and keep the country safe".

Witnesses at the arena described seeing metal nuts and bolts among the debris of Monday's bomb, and spoke about the fear and confusion that gripped concert-goers.

Andy Holey, who had gone to pick up his wife and daughter, said: "An explosion went off and it threw me about 30ft from one set of doors to the other set of doors."

Emma Johnson, who was waiting for her children, aged 15 and 17, said: "The whole building shook. There was a blast and then a flash of fire afterwards. There were bodies everywhere."

Media playback is unsupported on your device Media caption Phil Dick describes on PM how he took care of an injured young girl while searching for his own children

Teenager Abigail Walker told the BBC: "I had to make sure I had my sister. I grabbed hold of her and pulled hard. Everyone was running and crying.

"It was absolutely terrifying."

The explosion happened shortly after US singer Ariana Grande had left the stage and the 23-year-old tweeted: "broken. from the bottom of my heart, i am so so sorry. i don't have words".

Image copyright PA Image caption A forensic investigator was seen leaving the Fallowfield property holding a booklet called "Know your Chemicals"

Abedi, who had at least three siblings, had lived at several addresses in Manchester, including a property at Elsmore Road, Fallowfield, which was raided by police on Tuesday.

Armed police have also arrested a 23-year-old man in Chorlton, south Manchester, in connection with the attack.

Mr Hopkins said searches at two addresses had been carried out, including the one in Fallowfield, where a controlled explosion had been used to gain "safe" access.

He said Abedi had not been formally identified and so would not comment further.
The man suspected of carrying out the Manchester attack is identified as 22-year-old Salman Abedi, who died at the scene. Abedi was born in Manchester to Libyan parents.