A 12-YEAR-old boy was arrested after he headbutted his girlfriend and burned her with a cigarette.

Police said the youth and his girlfriend of the same age were arguing in Nancy Street, Darwen, when things turned aggressive.

The row was over her allegedly flirting with the boy’s brother.

He picked up a hammer and threatened her, before putting it down and headbutting her to the floor.

He then burned her with a cigarette, police said.

She called the police after the incident at 1.30am on July 15.

The boy was arrested on suspicion of assault and given a final warning.