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.


Floods, landslides kill 56 in India and 14 in Nepal
British police arrest five men at US air base in major incident
Bill Gates joins calls for AI safeguards, including legislation
Russian attacks kill three in Ukrainian cities
South African police hunt suspects after 27 killed in two separate shootings
Afghanistan says 28 fighters killed after crossing from Pakistan
Trump rejects Iranian proposal to open Hormuz and end fighting
Kazakhstan's Tokayev dismisses defence minister after 14 die during naval exercise
