A violent prison riot in the northern Mexico border state of Nuevo Leon has left 16 people dead and eight severely wounded.
Two guards and several inmates were wounded in the riot that took place yesterday, officials said.
The government said three more prisoners had died of their wounds today.
Officials told members of the local media that autopsies had not yet been completed to determine how many of the inmates died from bullets fired by state and federal police who finally quelled the riot.
One guard remains in serious condition after his lung was punctured.
The riot saw inmates take guards hostage, beat them and threaten to throw them off the roof of the state prison.
When police first went in trying to take control they were met by about 150 prisoners who attacked them with metal tools and rubble from work that was being carried out inside the prison.
In March, four inmates in the same prison died after they took control of a prison pharmacy and apparently overdosed.
In another prison in Nuevo Leon, 49 prisoners died when two factions of the Zetas cartel clashed in February 2016.