KENSINGTON is on lockdown and armed police have stormed Sony Music headquarters after two people were stabbed.
Trish Ellis, a personal assistant at the Mail on Sunday who witnessed the incident, said: "It started opposite our building in Derry Street, usual sirens and racket but then we heard shouting, and more and more sirens.
"A few people came out, then armed police were going in six-plus at a time, and more and more of them, but they seemed to be keeping people in the building.
"Gradually they started to release people in tens, twenties, and a stretcher turned up with all the medical kit on it, but just stayed outside."
A witness also eported seeing panicked people running from the incident while screaming.
The onlooker told the Evening Standard: "Large crowds of people began exiting the building's front door at around 11 o'clock.
"Most were running, all towards Kensington Square Garden. Several were visibly panicked and some were screaming."