A female police officer suffered "horrific" injuries in yesterday's Hainault attack and almost lost her hand.

A 36-year-old man remains in hospital after being arrested on suspicion of murdering a 14-year-old boy.

The arrested man sustained injuries when his van hit a house in Thurlow Gardens, which police were first called to just before 7am yesterday (April 30).

Four others, including two police officers who were stabbed, were also injured.

Live: Road closures remain in place as Hainault sword attack probe continues

Although their conditions are not life-threatening, Metropolitan Police Commissioner Sir Mark Rowley told LBC today (May 1) that a female officer was in surgery for several hours on Tuesday after suffering “horrifically serious” wounds to her arm.

She came close to losing her hand in the attack, he told host Nick Ferrari, while a male colleague also suffered serious injuries to his hand.

Speaking about the young victim who died, he said: “The first thing you have to say is for the parents involved, who’ve lost their 14-year-old, and that is just horrific, and it’s everyone’s worst nightmare. I''m sure we’re all thinking about them.”

Ch Supt Stuart Bell told reporters yesterday he did not believe it was a targeted attack, and it is not believed to be terror-related.

A man carrying a sword was tasered and arrested at the scene but has not yet been interviewed because of his injuries, the Met said.

Romford Recorder: A group of officers detaining the manA group of officers detaining the man (Image: Jordan Pettitt/PA Wire)Dramatic footage obtained by the PA news agency captured the man being cornered and tasered by officers on a residential driveway.

The video shows how officers shout at the suspect, saying “Don’t move, don’t f****** move” after he is brought to the ground by three separate Taser discharges.

The words “suspect contained” are eventually heard as a female officer pulls a sword away from the man.

RELATED: Boy, 14, dies after stabbing in Hainault 'sword attack'

A Buckingham Palace spokesman said the King’s “thoughts and prayers are with all those affected” by the “horrific” stabbings, adding: “In particular, the family of the young victim who has lost his life.”