A murder investigation has been launched following a stabbing in Harrow, the Met Police has said.
Police were called at 6.25am on Saturday to reports that a man had been stabbed in Pinner Road, North Harrow.
The man, believed to be in his 40s, died at the scene.
A man, aged in his 20s, was arrested on Saturday afternoon on suspicion of murder.
Enquiries are also ongoing to inform next of kin and a crime scene remains in place.