Updated 13:10
Two people have been stabbed at the headquarters of Sony Music in London.
Armed police were called to the scene on Derry Street in Kensington at around 11am this morning and the building was evacuated as a precaution.
Police said a man had been arrested and they are awaiting an update on the condition of the victims.
London Ambulance Service said one was taken to hospital and one was taken to a major trauma centre.
Reports have circulated that there was a fight between two members of kitchen staff.
"We just heard screaming and running and people slamming doors," said a Sony employee, who did not want to be named.
The men, who are employed by a catering company, were "running round chasing each other" and "slashing each other up", he added.
Employees of the company are currently being interviewed by police outside the office.
We are aware of an incident on Derry Street W8, police on scene including firearms officers and London Ambulance Service. At this time we believe two people are injured. Incident is on-going.
— Metropolitan Police (@metpoliceuk) November 2, 2018
Investigators said there was no evidence of the use of any firearms and the attack is not being treated as terror related.
Emergency services remain at the scene.
A London Ambulance Service spokesperson said: "We were called at 11:01 today to Derry Street, W8, to reports of an incident."
"We sent an incident response officer, two single responders in cars and two ambulance crews to the scene.
"We treated two people at the scene. We took one to hospital and one to a major trauma centre."