At least eight inmates of a prison in Mexico's central state of Jalisco have died following a violent clash on Friday.
Officials added that some died from bullet wounds while others were beaten to death.
Eight more prisoners have been hospitalised with minor injuries.
Authorities said a fight broke out as inmates participated in a sports activity.
Jail staff have recovered two firearms and a homemade explosive device, and detained five people for their alleged role in the incident.


Keiko Fujimori declared winner of Peru presidential race
Ukrainian rescuers clear rubble as Kyiv mourns 30 killed in Russian attack
Monaco blast suspect is a Ukrainian woman who fled to Germany
Clinical trials begin for two potential Ebola treatments
India issues notice to Telegram, Signal on concerns over usernames, source says
Blast at Damascus cafe kills nine, wounds 20
Rebels in Indonesia's Papua kill American pilot, burn plane
Russian air strikes kill 10, injure more than 50 in Ukraine's Kyiv
