Five people have been arrested in the relation to a stabbing of a 15-year-old boy in South London.

Zac Olumegbon was stabbed to death in a planned attack by suspected rival gang members as he arrived at school.

Olumegbon, from Brixton Hill, south London, was ambushed by four young men at the gates of Park Campus School in nearby West Norwood.

A second teenager, believed to be 14 years old, was also stabbed in the arm during the incident. A local shopkeeper described how Zac fell into the arms of a teacher after the attack.

Police believe four black males arrived in a car before the attack and a confrontation took place outside the school involving the two victims and the suspects.

Three of those being questioned by murder squad detectives after the incident are believed to be teenagers.

Zac was the 13th teenager to be killed in the capital this year as senior officers pull out all the stops to keep a lid on violence among young people.