Eleven people are being held on suspicion of murder after a fatal stabbing in central London.
The Metropolitan Police said the male victim died at a hotel in Euston Street, Camden, on Monday night.
He had entered the building from the street before collapsing in the lobby.
Staff came to his aid and police were called to the scene at about 10.45pm. The man was pronounced dead about 45 minutes later.
The suspects were taken into custody at separate London police stations, the force said.
Scotland Yard said inquiries were taking place to identify the victim and inform his next of kin.
A post-mortem examination will take place in due course.
Officers remain at the scene and cordons are in place.
Any witnesses or anyone with information about the incident is urged to call police on 101 quoting CAD 7945/18 Feb or contact Crimestoppers anonymously on 0800 555 111.