Mexico City, Mexico (CNN) -- At least 14 inmates died Friday in a prison riot in northeastern Mexico, the state news agency reported.
The riot broke out around 5 a.m. (6 a.m. ET) in a prison in Ciudad Victoria, the capital of the border state of Tamaulipas, the Notimex news agency said.
The fight broke out among competing inmate groups who want to assert their control over each other inside the prison, Notimex said. They attacked each other with knives and also beat one another, the news outlet said.