A teenager has been stabbed to death on a bus in south London.
The victim, believed to be 17, was found injured when police were called to Whitehorse Lane in South Norwood, Croydon, at about 20:30 GMT on Sunday.
The teenager was treated by paramedics but died at the scene 40 minutes later.
Scotland Yard said no arrests have been made. A Section 60 order, giving police additional stop and search powers, has been put in place across several areas until 13:10.
They are: Selhurst, Thornton Heath, Bensham Manor, South Norwood, Woodside, New Addington North and New Addington South.
Local roads were closed but have since been reopened.