An 11-year-old boy has been arrested on suspicion of attempted murder after a boy aged 14 was stabbed in north London.
Police said they were called to Fairbridge Road near Archway shortly before 7pm on Sunday.
The teenager was found with multiple stab wounds and taken by air ambulance to an east London hospital.
The Metropolitan Police said they were awaiting an update on his condition.
The 11-year-old boy was taken to a police station in north London.
In a statement, the Met said: "At this early stage officers retain an open mind as to motive."
Police have appealed for anyone who saw the stabbing to contact them.