Deadly attack on teen reignited concern around the problem of knife crime that has plagued the British capital for years.

Two British teenagers have been sentenced to life in prison, with a minimum term of 15 years, for stabbing to death a 14-year-old boy on a London bus in broad daylight earlier this year.

Judge Mark Lucraft at London’s Old Bailey court sentenced the pair, who cannot be named due to their age, to life in prison on Friday. He ordered that they be considered for parole after 15 years and 110 days in detention.

The teenagers stabbed 14-year-old Kelyan Bokassa 27 times with machetes on the bus in the Woolwich area of southeast London on January 7. He later died from his injuries.

The attackers – aged 16 and 15 at the time of the time of murder – were arrested later that month. The pair pleaded guilty to murder in May.