A British citizen born in Pakistan, Butt had even appeared in a 2016 documentary called "The Jihadis Next Door", where he was shown praying near an ISIS-style flag.
The incident was the third terrorist attack in England since March.
Khuram Shazad Butt and Rachid Redouane from Barking, east London, were named by police yesterday.
Worldwide desk - Police have released names and photographs of three suspected London Bridge attackers who were shot dead eight minutes after they used a van and knives to kill seven pedestrians.
Counter terror officers arrested a 30-year-old man in Ilford on the early hours of Wednesday morning, after a 27-year-old man was taken into custody in Barking, east London, on Tuesday.
Authorities said Butt was known to security services but Redouane was not.
"We are making inquiries and when we are able to confirm the name we will", a spokesman said.
And according to Italian media reports, Zaghba's status as a potential militant had been notified to the British and Moroccan secret services.
Then, his passport and cellphone were sequestered after he tried to board a flight for Turkey with a one-way ticket and a small backpack.
Le Parisien newspaper named the second Frenchman to die in the attack as 36-year-old Sebastien Belanger, while the other French victim was 27-year old Alexandre Pigeard. French authorities said a French national was also killed.
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The family of 32-year-old James McMullan, from Hackney, east London, said they believed he was also dead.
Forty-eight people were injured, 21 of them critically. NBC News reported that an American man who was shot in the head by a stray police bullet was expected to survive.
The dead include three Frenchmen, two Australians, a Canadian, a Spaniard and a Briton, reflecting the city's worldwide population.
Thomas had been missing since he was caught up in the attack with Delcros.
The so-called Islamic State (IS) group has said its "fighters" carried out the attack.
"At least 7 dead and 48 wounded in terror attack and Mayor of London says there is "no reason to be alarmed!"
"MI5 and the police have already said they would be reviewing how they dealt with Manchester and I would expect them to do exactly the same in relation to London Bridge", she said. "MSM is working hard to sell it!"
His friend Damien Lecomte, 34, told the Press Association on Monday: "He is the very definition of a friend - always here to help you, to listen to you, whatever he can do to help you, he is going to be there". Ms O'Leary never converted to Islam, and the couple recently broke up, said a woman who knew them.
The statement from imams came as more heroics of the victims came forward.
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