A riot and fire has broken out at a northern Mexico prison reportedly killing dozens.
According to local media reports the trouble is believed to have started this morning.
Witnesses said the fire broke out at about 12.30am (0630 GMT) amid shouts and sounds of explosions.
A thick cloud of smoke rose, apparently from inmates burning mattresses.
Mileno TV said at least 50 people including prison guards have been killed.
It has also been reported that some inmates have escaped from the Topo Chico prison near the city of Monterrey.
Riot police have been holding back concerned relatives of inmates who have gathered outside worried about family inside.
Some shook and kicked at the prison gates, demanding to be allowed in.
Officials have not yet confirmed the number of people killed in the riot.