Three teenagers have been arrested after a 17-year-old boy was stabbed to death in a street attack.
He was pronounced dead in Caledonian Road in Islington, north London, after police were called at about 19:00 GMT on Tuesday.
Two male suspects, aged 16 and 17, were arrested on suspicion of murder close to the scene, Scotland Yard said. An 18-year-old was later arrested at an address in Islington.
All three remain in custody.
The stabbing happened just over a mile away (about 1.6km) from The Emirates stadium, where Arsenal played Cardiff City on Tuesday evening.
Supporters were told to avoid Caledonian Road after the football match.
Formal identification has yet to take place but the Met Police said officers were “confident they know the identity of the deceased”.
A post-mortem examination was due to be held, the force added.
The teenage victim is the fifth person to be fatally stabbed in London so far this year.
Officers put in place a Section 60 stop and search order, which allowed police to search anyone in a given area until 03:00 on Wednesday.
That area covered much of Islington, Clerkenwell, Finsbury Park and Bloomsbury.
Elsewhere in the capital on Tuesday, a woman was found with stab injuries on Baring Road, Bromley, and in a separate attack a man was stabbed in Spray Street, Woolwich.
Both victims were taken to hospital with non-life threatening injuries.