The police had on Monday night named Butt and Rachi Redouane as two of the three attackers who were responsible for killing seven people and injuring almost 50 others at London Bridge and Borough Market on Saturday night.
Her son and the two other attackers rammed a van into pedestrians on London Bridge, then ran into the Borough Market area, and slit throats and stabbed people indiscriminately before they were shot and killed by police. Seven people were killed and 48 injured before police shot dead all three attackers.
The youngest of Saturday's attackers is said to have told Italian authorities "I'm going to be a terrorist", while officers reportedly found Islamic State-related material on his mobile phone when they intercepted him. Italian officials said suspicions about him had been shared with British authorities.
The officials spoke on condition of anonymity because they were not allowed to discuss details of the case. His name had also been flagged in 2015 by F.B.I. informant Jesse Morton who told authorities he had met Butt in an extremist internet chatroom used by Anjem Choudary, one of Europe's most prolific hate preachers who was jailed a year ago for his support of the Islamic State group, according to a British government official who spoke on condition of anonymity because he was not authorized to speak about the ongoing attack investigation.
Italy has expelled more than 40 people in the past two years who were suspected of radicalisation activities but for whom there was insufficient evidence to bring formal charges. Repubblica said when he landed in January at Stansted after a 10-day visit in Bologna, his name was verified in the SIS system but he was allowed to go.
Two men were arrested on a street in Ilford and the third was apprehended at an Ilford residence when police searched the home, authorities said.
One of those arrested is a man who allegedly worked out at the same gym as 27-year-old Khurum Butt, thought to be the attack ringleader.
If confirmed, Thomas would be the eighth person killed in the vehicle and knife attack.
Security measures were heightened on Thursday as millions headed out to vote in the general election. In particular, there are questions over whether investigators had the resources to look into complaints such as those levelled by Butt's neighbours about his attempts to radicalize children and whether crucial opportunities were missed.
Butt was a British citizen, born in Pakistan, who "was known to the police and MI5", according to authorities. Redouane had not aroused any suspicions.
Pc Iswa said: "As soon as I got there, I could see blood was coming out of his face, near the eye". "He was not a police or MI5 subject of interest", a police statement said.
- Other neighbors have told CNN that Butt had joined a mosque nearby after he severed ties with another community following an argument. One of his neighbours had called the police to warn them of his "extremist" leanings.
The latest opinion poll on voting intentions, by Survation for ITV, had the Conservatives' lead over Labour narrowing to just one point from six points in the same poll a week earlier.
Theresa May said a review had been launched after the Manchester bombing last month and she expected the same process following Saturday's rampage.
A nationwide minute of silence was held at 11 a.m.to honor all the victims.
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