Armed police stormed a road in central London after a man was stabbed following a fight outside BBC Radio 2's building.
Firearms officers rushed to Gildea Street, in Marylebone, just before 4.25pm on Wednesday after a fight broke out between two people outside Wogan House.
Witnesses claimed the men were walking past the building when an argument erupted and descended into violence.
Onlookers told the Standard that "drops of blood" had been seen in the doorway and in the reception area.
A 21-year-old man was later found suffering a stab injury to his hand, Scotland Yard said.
A police cordon is in place in the road close to the BBC headquarters in Portland Place.
The man’s injuries are not said to be life-threatening.
No arrests have been made.
Enquiries continue.
Police said the incident is not being treated as terror-related.
A spokesman added: “Firearms officers in the area attended the location to support local officers. Nothing to suggest a firearm was seen or used.”
Anyone with any information should contact police on 101 or call Crimestoppers anonymously on 0800 555 111.
