A 14-year-old boy has been stabbed to death in east London, police have said.
Police were called shortly before midnight on Saturday to St Thomas's Place in Hackney.
The teenager, who suffered a single stab wound to the stomach, was taken to hospital but died on Sunday morning.
A girl, thought to be about 16, was also found with slash wounds and is in a stable condition at a hospital. It is believed they were attacked after an argument with a group of youths.
The boy's death brings the number of teenagers killed in violent circumstances in London this year to 25.
No arrests have been made and police are now appealing for witnesses.
Detectives believe they know the identity of the boy, who was pronounced dead shortly after 0800 BST on Sunday, but are awaiting formal identification before naming him.
A post mortem examination is scheduled to take place on Monday at the Royal London Hospital.
The attack came just hours after a 16-year-old boy was fatally stabbed after an argument at a party in Liverpool.
Luke Howard was found injured by police who were called to a house on Ashcombe Road, Old Swan, Liverpool, at about 0700 BST on Saturday.
The teenager was taken to hospital with stab wounds but later died.
A 15-year-old has been charged with his murder.