The first reports on Twitter were of a trespasser on the tracks, causing delays to the Metropolitan Line and then the Jubilee Line, and then services out of Marylebone, which all indicated it was around this part of London. Add in police helicopters over Kilburn and it seemed clear that something major had happened.
Around 4.30pm, police officers stopped a man in Christchurch Avenue, Willesden Green who they believed him to be in possession of drugs. The man broke away from the two officers and escaped on foot. Both officers followed on foot.
The man was pursued and observed from a distance for around 40 minutes, during which time he was seen to run into gardens, climb over fences and go onto railway lines.
At 5.12pm, the man was hit by a train on the line near Dartmouth Road, Willesden. The man, believed to be in his 20s, was pronounced dead at the scene. Officers await formal identification and confirmation that next of kin have been informed. A post-mortem examination will be arranged in due course.