Axel Rudakubana was expected to be sentenced to life in prison at Liverpool Crown Court for the murders of three young girls and attempted murders of eight other children in Southport in July.

Six months after a teenage attacker stabbed three girls to death at a children’s dance class in England, new details about his background have sparked questions about how authorities repeatedly failed to spot the threat he posed.

A British teenager on Thursday repeatedly interrupted the start of his sentencing for murdering three young girls at a Taylor Swift-themed dance event last July, shouting from the dock that he was unwell before being removed.

Axel Rudakubana, 18, pleaded guilty to murder and attempted murder after attacking children and two adults at a dance class last July.

A British teenager who murdered three young girls at a Taylor Swift-themed dance event was jailed for at least 52 years on Thursday, for an atrocity prosecutors said was so violent it appeared he had tried to decapitate one of the victims.