A British teenager who murdered three young girls at a Taylor Swift-themed dance event was obsessed with violence and genocide, prosecutors said on Thursday after the killer was removed for repeatedly interrupting his sentencing.

A British teenager on Monday pleaded guilty to charges of murdering three young girls in a knife attack in northern England in July, a crime that horrified the nation and was followed by days of nationwide rioting.

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.