A teenager stabbed to death in Hillingdon has been named.
Hakim Ishmael Daba Sillah, who was 18, died in hospital after he was stabbed while attending a youth offending service at Hillingdon Civic Centre on Thursday afternoon.
Another 18-year-old was also stabbed. His injuries are not life threatening.
Police have arrested a 17-year-old. He is being questioned at a north-west London police station.
Detective Chief Inspector Noel McHugh is leading the investigation. He said: