Detectives investigating the murder of a teenager who was stabbed to death in east London are hunting a second suspect over the attack.
A 17-year-old boy appeared in court charged with the murder of Israel Ogunsola, 18, and possession of an offensive weapon on Saturday.
But police are appealing for witnesses to trace a second suspect they believe was involved in the alleged attack.
The victim was found fatally wounded in Link Street, Hackney, by officers on patrol at around 8pm on Wednesday and was pronounced dead 25 minutes later.
A post-mortem examination gave the cause of death as stab wounds.
Scotland Yard's Detective Chief Inspector Paul Considine said: "Whilst we have one male appearing in court charged with Israel's murder, another remains at large.
"We are particularly keen to trace a second suspect described as a young black male wearing black clothing who was at the scene of the murder.
"There are people in the area who know what happened that have yet to call police.
"Their information is vital to building a clearer picture of what took place, securing important evidence and apprehending everyone involved. We need you to call.
"A young man with his whole life ahead of him has been murdered and his grieving family deserve answers and justice."
The 17-year-old charged with murder will next appear at the Old Bailey on April 10, while a second 17-year-old arrested on suspicion of murder has been bailed to a date in mid-April.
Police are urging anyone with information to call the incident room on 020 8345 3734 or contact Crimestoppers anonymously on 0800 555 111.