The unnamed officer was attacked in the arm this afternoon while chasing a suspect.
Police were called at approximately 1.15pm after reports of mana with a knife on Hendon Way.
North West BCU Commander Roy Smith said: “This is another example of the dangers our officers face on a daily basis as they go about their duty protecting the people of London.
“Knowing that there were reports of a man in possession of a knife, this police constable and his colleagues ran to challenge and apprehend him – these are truly brave actions.
“I have visited the injured officer in hospital and thankfully he should make a full recovery from his injury.”
More to follow…