The three men who drove a van into pedestrians on London Bridge and then stabbed people with 12-inch knives in nearby Borough Market on Saturday evening have been identified by the police.
In March 2016, Italian officers stopped Zaghba at Bologna airport and found IS-related materials on his mobile phone.
A second source said Italian authorities had flagged him up to British authorities after he moved to England a year ago.
The Metropolitan Police said Butt "was known to the police and MI5" but there was no intelligence to suggest the attack was being planned.
A new search was underway today in a neighbourhood near the home of two of the London Bridge attackers, hours after police said they had freed everyone detained in the wake of the rampage that left seven dead and dozens wounded.
In particular, the revelation that at least one of the attackers, Khuram Butt, was well known to security services has raised concerns that they lack the resources to prevent attacks. The force says formal identification has not yet taken place, but Xavier Thomas' next of kin have been informed.
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The two main candidates for prime minister - the incumbent, May, and the challenger, Jeremy Corbyn - traded barbs Monday over how security services can better protect the public after three mass-casualty attacks in as many months. One of the dead attackers has been pictured wearing an Arsenal shirt.
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Taliesin Myrddin Namkai Meche, 23, also died in the attack, while Micah Fletcher, 21, suffered non-life-threatening injuries. George Tschaggeny was wearing Ricky Best's ring when officers arrested him Friday morning beneath an overpass, Sgt.
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Authorities became suspicious when they realised Zaghba had only booked a one-way ticket and was travelling with a small rucksack, according to Italian newspaper La Repubblica.
Christine Archibald, 30, a Canadian social worker who moved to Europe to be with her fiancé, was the first victim to be named.
People look at floral tributes on London Bridge, Wednesday, June 7, 2017, to commemorate the victims in Saturday's attack.
Butt's neighbors also said that he had previously worked for a branch of the fast food chain KFC, as well as London transport operator Transport for London (TfL).
Foreign Secretary Boris Johnson acknowledged the security services had to provide answers.
Prime Minister Theresa May has vowed that "things need to change" after Britain suffered its third terrorist attack in as many months, as officials try to piece together the events leading up to the attack. I always said there were terrible things that they didn't show him.
A woman is comforted by her friend on Tuesday as she breaks down in tears after a minute's silence in London near the scene of Saturday's terrorist attack.
Between 2009 and 2016, the number of police officers fell by nearly 20,000, or around 14 percent, according to the independent Institute for Fiscal Studies think-tank.
The spokesperson added: "Specially trained family liaison officers have been deployed to support the families of all those people that police believe died in the attack".
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