Picture shown is for illustrative purposes only.
A violent clash at a prison in Mexico's central state of Jalisco on Friday left eight inmates dead and another eight prisoners hospitalised with injuries, state security officials said.
During the incident at a jail in the Puente Grande complex, three people were killed by firearms and four others died from beatings, Jalisco's prosecutor Gerardo Octavio Solis said in a press conference.
Authorities later confirmed another death, after nine people were initially hospitalized. They said the fight broke out as inmates participated in a sports activity.
Officials said jail staff never lost control of the facility or were threatened, and that they recovered two firearms and a homemade explosive device.
Five people were detained for having a possible role in the confrontation. As part of the investigation, authorities said they will probe whether any public officials were involved.
The office said police and soldiers had been sent to secure the area, where groups allied with the Sinaloa cartel have been fighting other gangs, including a remnant of the Beltran Leyva gang and others aligned with the Juarez cartel.
The discovery of the bodies was another reminder of the task facing President Andres Manuel Lopez Obrador, who took office in December vowing to reduce the gang-fuelled violence.
The crash occurred in a remote, hilly area of the north-central state of Queretaro on Friday. The MI-17 helicopter, which took off from Valle Verde in the neighbouring state of San Luis Potosi.
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The group were travelling through Badakshan province to assist security forces in the area, officials said. A local commander was among the fatalities, provincial governor's spokesman Sanaullah Rohani told the media.