A 14-year-old boy has died after being stabbed by men who crashed into him with a car in northeast London, police have said.
Officers found the victim with fatal injuries after being called to a road traffic collision in Bickley Road, Waltham Forest, shortly before 6.30pm on Tuesday.
The teenager was riding a moped which was involved in a crash with a car, police said.
Detectives said they believe three males got out of the car then stabbed the victim before getting back in the vehicle and driving off.
Paramedics arrived with the police and tried to save the boy but he was declared dead at 7.09pm. His next of kin have been informed.
People living on Bickley Road said the incident happened on their street but they did not hear any shouting or screaming.
They said they only knew something had happened when they saw the emergency services' blue flashing lights.
No arrests have been made and a crime scene remains in place.
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Mayor of London Sadiq Khan urged anyone with information about the "horrific incident" to contact police.
:: Anybody with information is asked to contact the police on 101 or Crimestoppers anonymously on 0800 555 111.