A 17-year-old boy who was fatally stabbed in a park in Bedfordshire has been named by police.
Michael Simwanza was stabbed at the Kingsway Recreation Ground, in Luton, shortly before 1515 BST on Saturday and taken to hospital where he later died.
It is believed he was involved in an argument with another man before both walked behind the club house, where he was stabbed.
Michael lived in the Farley Hill area with his mother, sister and brother.
A post mortem examination found he died from a stab wound to the chest.
Police want to talk to a man described as white, about 5ft 8in (1.73m), with long, big and dark sideburns.
He was wearing a green/grey hooded top, green/grey trousers, possibly combats, and a black cap.
He ran from the scene towards Beverley Road.
Det Ch Insp Mark Ross said: "This stabbing happened in a public area and it has understandably left a local community feeling extremely vulnerable, which is why it is vital that people with information about what happened come forward and speak to the police."
"We cannot tolerate the use of weapons in our town so I urge anyone who has information about the offender to contact the police.
"Michael was a young man who could have had a bright future ahead of him. His loved ones deserve to see those responsible for his death brought to justice."
Anyone with information about this incident or who can help identify the offender is asked to call Bedfordshire Police.