Less than two weeks earlier, a suicide bomber had killed 22 adults and children at a pop concert in Manchester and, in March, five people died after a auto was driven into pedestrians on London's Westminster Bridge.
He was stopped at Bologna airport on 15 March past year travelling with just a backpack, very little money and a one way ticket to Istanbul; crossing the border from Turkey into Syria had become a regular route for those seeking to join rebels fighting the Bashar al-Assad's regime.
"The investigation will need to look at whether this was a pure coincidence or whether they had got in touch with each other and were following Daesh instructions - which have been often repeated - to carry out acts of jihad in Europe if one couldn't get to Syria". The 21-year-old worked as a nanny in London and had previously been described as missing since Saturday night.
The Italian newspaper Corriere della Sera said in a report that the Italian intelligence services reported Youssef's movements to their British counterparts. He lived in Morocco for much of his life but made short visits to his mother.
Zaghba was reportedly working in a London restaurant and had not been seen in Italy since 2016.
After questioning him, police phoned his mother who, according to the source, said she had been anxious about her son because he had been talking about jihad. Like Butt and Redouane, he lived in east London.
The Met's Counter Terrorism Command has released the name and photograph of the third attacker shot dead by police following the terrorist attacks on London Bridge and at Borough Market on Saturday. The 48 injured included people from Britain, France, Spain, Australia and New Zealand.
British police have confirmed the identity of two of the three attackers but had been retaining the name of the third while investigations into possible accomplices and contacts continued.
The Islamic State terror group has claimed the rampage, which sparked fears that Britain is in the grip of a spate of copycat incidents.
Questions have swirled over why police were unable to do anything about Butt.
A total of 19 people have been arrested in Britain as part of the terror probe, 12 of whom have been released without charge.
In two videos viewed by CNN, Butt is among a group of men searched by police in 2015 after a member of the public reported seeing the group praying in a park with what appeared to be an ISIS flag.
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"The arrest was planned beforehand and there was no direct threat to the airport", Greater Manchester Police said in a statement.
In his neighbourhood, Butt was known as Abu Zaitun - or Abu for short.
"Our work necessarily involves making hard judgements about how to prioritise the resources available to us at a time when the United Kingdom is facing a severe and high tempo terrorist threat", police said.
Another attacker, 27-year-old father of two Khuram Shazad Butt, was also known to the police.
Earlier yesterday, a poll conducted by Survation for ITV before the London attack, had the Conservatives' lead over Labour narrowing to just one point from six points in the same poll a week earlier.
The number of police officers in England and Wales fell by nearly 20,000 between 2010 and 2016 - years when May, as home secretary, was in charge of policing.
Earlier Wednesday, Spain had urged British authorities to speed up the identification of the dead and wounded in the London Bridge attacks to spare families more suffering.
Commuters walk across London Bridge, with new security barriers, after work in London, Tuesday, June 6, 2017.
The area around Borough Market is not expected to reopen Tuesday.
Transport for London, which oversees the capital's transport network, has advised commuters to make alternative journeys as the station will be busy.
Britain has been experiencing a number of violent attacks in the past few days.
It's not clear when that call came in - and what other cases were pressing - but ultimately Butt was not considered a priority and he was placed in the lower echelons of the long list of individuals under investigation.