At least 31 people were killed and 13 wounded Wednesday in a battle among inmates that broke out in a prison in the northern Mexican border state of Tamaulipas, the state government said.
The fighting broke out in the Santa Amalia prison in the city of Altamira, a site designed to hold 2,000 inmates but which has a population of more than 3,000.
Authorities regained control after police moved in, the statement read, adding that 13 inmates involved in the fight were detained.
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Federal police forces and soldiers earlier surrounded the prison, a federal source told AFP.
The prison is located in an area where the rival Gulf and Zetas gangs have a strong presence, and many of the inmates are doing time on drug-related charges.
Deadly riots and prison fights are common in Mexico's overcrowded prisons.
Twenty inmates were killed and 12 wounded in a mid-October prison fight in a jail in the border town of Matamoros, just across from Brownsville, in the US state of Texas.
