Two machete-wielding teens who smiled as they fatally stabbed 14-year-old aspiring rapper Kelyan Bokassa on a bus 27 times in a 14 second attack have been jailed for life.

Kelyan was stabbed around 27 times on a bus in south-east London in January

The defendants, who cannot be named, boarded the bus 20 minutes later each armed with identical machetes hidden in their clothes.