Police say inmates at a Guatemalan juvenile prison killed one of their teachers during a riot and mutilated him.

Police spokesman Donald Gonzalez says the prisoners took three of their teachers hostage to protest the transfer of several of their fellow inmates to another detention center.

He says they killed one of the teachers, Winter Vidaurre, before police regained control of the prison using tear gas. Gonzalez said prisoners removed Vidaurre's heart.

The violence erupted Tuesday at the Stage 2 detention center. It was unclear how old the rioters were.