The riot took place in the prison of Atlacholoaya, in the central Mexican state of Morelos, when a confrontation between rival gangs saw the national guard, federal and state police enter the facility after an unspecified number of prison guards were taken hostage.
Local media report six prisoners were killed in the riot, among them Raymundo Isidro, alias El Ray, who is considered the leader of the Cartel Jalisco Nueva Generación in Morelo.
He had been arrested on May 7 and was reported to being involved in a shooting at a restaurant which took place on April 16, where six people were killed, including three children, in Cuautla, also in the state of Morelos.
The other victims were identified as Jose Manuel, Roberto, Lorenzo, Vicente and Nestor, who were also pronounced dead, while the two injured prisoners were named as Leopoldo and Adalberto.
Uriel Carmona, the prosecutor of the state, said that the inmates died due to the use of blades and denied firearms were used. To this day it is unclear who killed the victims.
Authorities sent 115 officers of the national guard, and 120 agents from the secretary of national defence to help restore order while two helicopters were also used in the operation. The prison guards were eventually released after four hours.
Pablo Ojeda, the Secretary of Government of Morelos, said that a day before the riot another fight had taken place between inmates over stolen shoes. One inmate was killed and a further two injured in the fight, meaning seven prisoners were killed in the prison in 24 hours.
There are no updates on the condition of the injured inmates at this stage.