A murder investigation has been launched after the death of a man at a care centre for adults with mental health and drug abuse issues.
The 60-year-old died after being assaulted shortly before midnight on Monday at the facility in Hayes, west London.
The man, who was a resident at the centre, was treated by paramedics but was pronounced dead at the scene.
A 44-year-old man, who was also a resident there, has been arrested on suspicion of murder, the Metropolitan Police said.