At least 25 inmates have died in clashes between two rival factions in a prison in far northern Brazil, according to local news media citing police.
Seven of the dead were beheaded and six burned to death in Sunday's violence in a prison in Boa Vista, the capital of Roraima state, the news site G1 reported, citing local police.
The bloodshed began when inmates of one wing of the Agricola de Monte Cristo prison broke into another wing.