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.

Axel Rudakubana, 18, faces a sentencing hearing Thursday at Liverpool Crown Court in England over the July 29 attack.

The British government announced a public inquiry into how a teen who went on a stabbing rampage killing three young girls, slipped under the net of authorities despite having a very troubled history.

A UK judge is due on Thursday to sentence a teenager who brutally murdered three young girls in a stabbing spree last year that sparked the country's worst riots in over a decade.