London suspect had been known to police, MI5

The two other perpetrators were not known to security services.

Twelve people who were arrested in Barking on Sunday - believed to include relatives of the dead men - have now been released by police. In the documentary, Butt can be seen praying in a London park. No arrests had been made, police said.

Seven people were killed and dozens injured in the attack on London Bridge and the Borough Market area of central London on Saturday night.

In what it said was an unprecedented move, the Muslim Council of Britain said more than 130 imams and other religious leaders had refused to perform the traditional Islamic funeral prayer for the attackers. "I'm sure the police will look into what they knew, what they could have done, what they did do and if anything could have been done differently", Khan said on BBC Breakfast.

But he appeared in a Channel 4 documentary entitled "The Jihadis Next Door" about British extremists that was broadcast past year, according to local media.

Another of the attackers has been named by police as Rachid Radouane, 30, from Barking.

Butt, who is thought to have also gone by the name Abu Zaitun, was known to neighbours by the nickname "Abs/z" and was allegedly an associate of radical hate preacher Anjem Choudary.

Butt featured in a Channel 4 documentary previous year about Islamist extremists with links to the jailed preacher Anjem Choudary. TfL confirmed to The Guardian that he had worked as a trainee customer services assistant for six months a year ago.

Melissa McMullan told reporters on Monday that she believed her brother James McMullan, 32, from Hackney in east London, was also killed in the attack after police told the family that his bank card was found on one of the bodies. Police confirmed that he was known to them and to MI5, the British intelligence service, but said they did not have evidence of a terrorist plot.

Defending the actions of the security services, he added: "At any one time MI5 and police are conducting around 500 active investigations, involving 3,000 subjects of interest".

"Work is ongoing to understand more about them, their connections and whether they were assisted or supported by anyone else", Rowley said. Her family said she had died in her fiancé's arms after being struck by the attackers' speeding van.

"I don't wish to enter into a row between ... individuals who are I think are probably perfectly able to stick up for themselves", he said of Trump and Khan.

Yesterday, London Mayor Sadiq Khan invited Londoners to a vigil at Potter's Field Park yesterday to remember the victims.

President Donald Trump's decision to knock London Mayor Sadiq Khan on Monday didn't come out of nowhere. "Kirsty - we love you and we will miss you dearly". "You will not win", Khan said to applause.

Among those radicalised by Muhajiroun were the suicide bombers who killed 52 people on London's public transport system in July 2005, and the men who murdered soldier Lee Rigby in the capital in 2013.

The area around Borough Market is not expected to reopen Tuesday.

But the premier also faced mounting criticism for her record on security in the six years she served as Britain's home secretary before becoming prime minister last year.

The attack, the third in Britain in three months, has raised questions over the government's ability to protect Britain following cuts to police numbers in recent years.

Rachid Redouane was named as the second attacked and inquiries are ongoing to identify the third attacker.

  • Leroy Wright