Police have formally identified the man stabbed to death at a fairground in Southall. 23-year-old Surjeet Singh died after a fight broke out at the fair on Monday. Seven men have been arrested on suspicion of murder.
A post-mortem examination on Tuesday gave the cause of death as a single stab wound to the neck.
Detective Chief Inspector Russell Taylor, leading the investigation, said: "We still want to hear from people who can help us piece together the events that led up to this murder."