It added that "one person has been arrested". I thought he was punching him and then I realised he had a big kitchen knife in his hand.
The member of staff, who did not want to be named, said they had heard "screaming and running and people slamming doors".
Firearms experts and first responders were directed to the Derry Street, Kensington headquarters where they found the company's catering team embroiled in a bloody affair.
A helicopter circled above and roads around the area were cordoned off. Offices were evacuated, police said, as a "precaution".
As she made her way out of the building, she said she saw a Sony staff member in tears and armed police storming up the stairs. "Two people have suffered stab injuries - we await an update on their condition".
Armed police rushed the building and video footage revealed the evacuation underway with emergency series on the scene.
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'Officers, including firearms officers, and London Ambulance Service are in attendance. They said one person had been arrested and it was not being treated as terrorism.
Sony Music has confirmed that there was an incident at its Derry Street HQ in London, UK earlier today (November 2) following multiple news reports.
Photos showed a large number of police cars and ambulances in front of the building in an upscale neighborhood.
The force said there was no evidence any firearms had been involved in the incident. "Not being treated as terror related". "We took one to hospital and one to a major trauma center", she said.