An inmate was stabbed to death and three others injured Friday during a brawl at Dos de Mayo prison in the northern Dominican city of Moca, authorities said.

The fatality was identified as Lorenzo Batista Vargas, a native of the nearby city of Santiago, who was being held pending trial for robbery.

Batista Vargas died of stab wounds inflicted by another convict who has not yet been identified, Moca’s chief prosecutor, Jacobo Marchena, told reporters.

Three inmates were slightly injured during the fight, whose cause is being investigated.

During the incident, other inmates got together and forced the military guarding the prison to scatter those in the fray by firing shots in the air and tossing tear gas bombs in the patio, some of the prisoners said.

The incident occurred a week after three prisoners at the same jail were moved to other penitentiaries due to another brawl in which several inmates were severly battered.