A youth was given a life sentence for stabbing to death a teenager who tried to gatecrash a 16th birthday party.
Ahmed Ahmed, 17, was ordered to serve a minimum of 15 years after being convicted at the Old Bailey of murdering Tommy Overton, 18.
Mr Overton was killed after he was turned away from the house party in east London with his brother and a group of friends in August last year.
A group of youths followed them and chased them down the road before Ahmed, then aged 16, stabbed Mr Overton through the heart.
Sentencing him to be detained at Her Majesty’s pleasure, Judge Charles Wide said Mr Overton’s group were running away and were no threat.
He told Ahmed: “Tommy Overton was not as nimble as the others in the group. He was attacked from behind. He turned round and fought back with his brother.
“You simply ran up and stabbed him through the heart. CCTV shows an element of swaggering as you walked off and discarded the knife.”
Mr Overton staggered off but was attacked again and stabbed a further six times by youths as he was dying. He got home before collapsing in front of his family.
The court was told Ahmed had previous convictions including having a Swiss army knife at school and battering another pupil when he was 14, and was caught with a knuckle-duster in the street when he was 15.
Ahmed, of Stratford, east London, was under probation service supervision for having drugs when he killed.
Zoe Johnson, QC, prosecuting, said the party in Leyton had attracted a large number of youngsters.
Kondwani Phiri, 18, of Forest Gate, east London, was found guilty of violent disorder and given three-and-a-half years of detention.