Seven people were killed and dozens wounded in Saturday's attack.
As details about Butt emerged, however, they prompted questions of whether he could have been stopped sooner.
Butt's apparent zealotry led one neighbor, Erica Gasparri, to contact police about 18 months ago.
One of the London Bridge attackers was 27-year-old Khuram Butt, a British citizen born in Pakistan.
May said Khan was doing a good job and it was wrong to say anything else. "He kept talking about the Islamic State".
Salaudeen Jailabdeen, who lived near Butt, said the alleged assailant had once been ejected from a local mosque for interrupting an imam.
Ignacio Echeverria, 39, remains missing since Saturday attack. He said the vehicle was seen going the wrong way down a one-way street and was later seen speeding off, followed closely by a small red auto.
Redouane was not known to the police. He used two different birthdates that would make him either 25 or 30, authorities said.
All three were ultimately shot and killed by police. One of the arrested men and one woman have since been released.
"There's an election on Thursday, that's the chance", he said.
May hit back that Corbyn himself was weak on the issue of terrorism.
May's main opponent, Labour leader Jeremy Corbyn, backed calls for her resignation over the police cuts.
But with Britons due to vote in a national election on Thursday, her decision to reduce the number of police officers in England and Wales by nearly 20,000 during her six years as interior minister from 2010 to 2016 shot to the top of the political agenda.
She said providing more firearms for London police wouldn't be a sensible solution to the increased tempo of attacks, saying the strategy of having special mobile units of heavily armed officers is effective. "He would always bring his kid out into the lobby", said Chigbo. According to the BBC, a witness to the attack heard one or more of the perpetrators say "this is for Allah".
The authorities are still working to identity the third attacker. From there, a number of scenarios can unfold. The real test comes in determining whether the person has the potential to become violent and what resources are available to investigate. "A message should have been passed onto the counterterrorism section, and if the report had some degree of credibility, an assessment would have had to have been made".
Echeverria's family explained that he was probably not carrying any identification at the time of the attack, and although they know he is not among the seven fatalities, they have been unable to get confirmation as to whether or not he was injured.
It was lowered once intelligence agencies were comfortable this wasn't the case.
"I commend the strong leadership of the mayor of London as he leads the city forward after this heinous attack", the acting ambassador said.
The latest attack comes against the backdrop of parliamentary elections later in the week.
Yesterday morning there was no train service to London Bridge station.
Sadiq Khan attended a vigil for victims of the London Bridge attack.