Detectives investigating the death of 18-year-old Jamie Meah in Leeds have arrested four people on suspicion of murder.
The men, aged 18, 19, 24 and 30, have all been interviewed and released on bail.
Jamie died in hospital after being fatally stabbed in an attack at the junction of Hall Lane and Brentwood Terrace in Armley on Friday, 31 March.
He was with a 16-year-old male who also suffered serious injuries.
The victims had been in a taxi when they were stopped by suspects in another vehicle.
They were then attacked on the street by the suspects who were carrying bladed weapons.
A West Yorkshire Police spokesperson said; “Detectives from the Homicide and Major Enquiry Team are continuing to appeal for information which could help their ongoing enquiries.
“Information can be passed to the police by using 101 Live Chat online or by calling 101, quoting crime reference 13230180255. Information can also be given anonymously via the independent charity Crimestoppers on 0800 555 111.”