A 15-year-old boy is facing a life sentence after being found guilty of stabbing a student to death in a row over conkers.

The teenager was found guilty at the Old Bailey in London of murdering architecture student Steven Grisales, 21.

Grisales died last August after he went over to remonstrate with a group of young people throwing conkers still in their spiky husks. He was walking to Silver Street station, Edmonton, north London, when he was attacked.

The teenager, who cannot be identified for legal reasons, was remanded in custody to be sentenced next month.

After the verdict, Detective Inspector Richard Beadle said: "Steven did no more than stand up to unruly youths and for that he has lost his life. The defendant's arrogance and contempt for others belies his age."