These X-ray images show how a 16-year-old boy narrowly escaped death when a 5in knife was plunged into his head during an attempted street robbery.

The teenager and two other young men were injured when they tried to stop a friend being robbed at a bus stop in Walworth, southeast London, in November last year.

The boy, who cannot be named for legal reasons, was taken to hospital with the knife still in his head. After a delicate operation he has made a good recovery and has started college, although he still needs hospital checks. His attacker, a 17-year-old, who also cannot be named, was convicted of attempted murder and grievous bodily harm by Inner London Crown Court last week.