A man has been arrested on suspicion of murder after a teenager died following a street fight in Bradford.
West Yorkshire Police were called to the Newton Street area just after 14:30 BST on Friday to reports of a number of men fighting with knives.
A 19-year-old man was found with serious injuries and died at the scene, officers said.
The force said three other men have been arrested on suspicion of offences including affray.
Det Ch Insp Dan Bates said: "A full investigation is ongoing into what has clearly been a very serious incident which has resulted in a young man losing his life.
"A number of initial arrests have been made and we are appealing for witnesses and information, as we work to determine the full circumstances of what took place."
He added there would be a number of police scenes in place during the evening and officers would be patrolling to reassure residents.
West Yorkshire on BBC Sounds
