Since Butt, Redouane and Zaghba attacked London, Scotland Yard's counter-terrorism command have been hunting any associates who may have helped them or had knowledge of their plans.
"We can confirm that 46 shots in total were fired by eight police officers - three officers from City of London police and five from the Metropolitan police service".
Searches were underway at the residential property and a business address in Ilford, the latest in a series of raids since the weekend assault.
Britain will ramp up security at polling stations during June 8 general election in light of the recent London terror attack, British media reported Tuesday.
On Saturday night, three men rammed a van into pedestrians on London Bridge before running into Borough Market, where they attacked people with knives.
Police are now trying to piece together how the three men met, and how they planned the attack.
In a blurred soundless video, recorded from a security computer monitor, the three suspects are seen walking down Stoney Street in Borough Market before rushing to attack a passerby.
Another neighbour, Michael Mimbo, told Reuters that Butt supported the north London football team Arsenal.
Saturday's rampage followed a suicide bombing that killed 22 adults and children at a pop concert in Manchester two weeks ago, and an attack in March when five people died after a vehicle was driven into pedestrians on London's Westminster Bridge.
After two deadly attacks in as many weeks it has become a battle over security.
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It comes after two Australians were confirmed dead in the attacks. "One witness said he saw a woman stabbed '10 or 15 times" by the men, who he said shouted, 'This is for Allah'.
Chief Constable Paul Crowther said: 'Having visited the PC in hospital a number of times and hearing first-hand the incredible account of his actions on Saturday night, I am proud that he is part of the BTP family.
NHS England, the British health authority, said Wednesday that of the dozens of victims hospitalized after the attack, 10 people remain in critical condition.
The ex-partner of 30-year-old Redouane earlier spoke of her shock at discovering he had inflicted the outrage on the capital.
'I feel like I did what any other person would have done.
The Italian reports said Zaghba was intercepted at the Bologna airport past year as he was about to board a plane for Turkey, apparently with the intention of joining Islamic State militants in Syria. "One of my friends would let Abz babysit his daughter", Mimbo said.
Charisse O'Leary said she has "shed many tears for the people caught up in this horrific incident". They said one arrest had been made on Tuesday.
Butt, who also went 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.
Al-Muhajiroun has been linked to half of all terror plots by British nationals in the United Kingdom and overseas over the last two decades, according to research published in 2015 by Raffaello Pantucci, a terrorism analyst at the Royal United Services Institute.
The revelations add to concerns that security services repeatedly missed opportunities to stifle the threat from Butt, who was also reported for extremism in Britain and appeared in a Channel 4 documentary about jihadists.
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