Third London attacker was known to United Kingdom security services

People react in front of floral tributes on the south side of London Bridge near Borough Market after an attack left 7 people dead and dozens of injured in London, Britain, June 5, 2017.

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.

According to The Independent, Italian authorities had informed their British counterparts in April 2016 about Zaghba's efforts to join Islamic State.

Zaghba was first identified earlier on Tuesday by Italian newspaper Corriere della Sera, which claimed that Italian intelligence services had informed British and Moroccan authorities that they believed him to be unsafe.

A number of barriers on various bridges have been installed by London officials since the attack to protect pedestrians.

Zaghba's mother, who is a convert to Islam, told police she was anxious about her son when she went to collect him after he was stopped at the airport, an investigative source said.

The officials spoke on condition of anonymity because they were not allowed to discuss details of the case.

He wasn't charged due to "insufficient evidence". Zaghba's Italian citizenship prevented such an expulsion, Italian daily La Repubblica said. Witnesses told the BBC that van hit "five or six people, ' then the attackers exited the vehicle and pursued others in a "rampage" in which hundreds ran for their lives".

Butt "was known to the police and MI5", the domestic security service, but there was no intelligence to suggest the attack was being planned, the Metropolitan Police said.

Butt was a British citizen born in Pakistan.

Khuram Butt, of Barking, was known to British police and MI5 and was subject to an investigation in 2015.

But the focus of attention remains on Butt, who had featured prominently in a 2016 Channel 4 documentary about extremists linked to the jailed preacher Anjem Choudary.

London police early Wednesday arrested a 30-year-old man in east London in connection to the lethal attack on London Bridge and are searching his home. A search warrant is also being executed at an address in Barking. In a letter posted outside Tuesday, the Ummah Fitness Centre said staff would "help the police in any way we can".

The attack, and prior attacks in Manchester and near Parliament in London, have prompted Prime Minister Theresa May to call for tougher counter-terrorism laws even if it means changing human rights protections.

  • Leroy Wright