The man – whose identity has not yet been released by the authorities – has been described by those in his neighbourhood as a friendly individual and that most had not seen the incident coming.
Good Morning Britain reporter Richard Gaisford spoke to people in the killer’s local community about their neighbour.
He told hosts Susanna Reid and Piers Morgan: “Well, we’re not giving their names at this point. We’re expecting formal identification to come a little later today.
“Cressida Dick the [police] commissioner has said they’ve already seized useful forensic information. At the moment a picture of one of the dead terrorists hit social media yesterday, a group of people in Barking knew exactly who he was. He’d been living amongst them for a number of years.
“One woman told me he’d been handing out cupcakes on their doorsteps less than a week before the attack and Muslim families saying it was to celebrate Ramadan. He’d organised a number of BBQs in the area, he’d been playing football in the area with children.”
He continued: “Interestingly, we heard from one person who said they had reported him to police a number of years ago.”
Good Morning Britain host Richard Gaisford reports on the attack
Scenes from the attack on London from the weekend
One woman told me he’d been handing out cupcakes on their doorsteps less than a week before the attack
The latest updates come as police carry out raids in Newham and Barking as Scotland Yard revealed that they knew the identities of the three attackers.
A number of people are said to have been detained following the police raids.
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Resident are said to have heard “loud flash bangs and gunshots”, according to the Telegraph.
Morning after London attack: Heightened police presence at Borough Market & Bridge Sun, June 4, 2017
SIX people have been killed after a horrific terror attack targeted London Bridge and Borough Market on Saturday night. These are the pictures are London wakes up to the tragic scenes
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The first victim of the London attack has been named as Canadian Chrissy Archibald, who was visiting her fiancé.
So far seven people have been killed and scores more have been injured in the incident that shocked the capital.
Good Morning Britain airs weekdays on ITV at 6am.