Mexico City, Mexico (CNN) -- At least 23 prisoners were killed and 20 injured in a prison riot Wednesday in the northern Mexican state of Durango, state officials said.
Guards quelled the deadly fight and police were stationed throughout the prison, the state-run Notimex news agency reported, citing the state's attorney general, Daniel Garcia Leal.
The motive behind the inmate riot was unclear, but tensions remained high inside the prison, Garcia Leal said.
The riot appeared to have happened at a prisoner in-processing area, but violence may have simultaneously broken out in other parts of the building, he said.
The names of the victims were not immediately available.
Concerned family members of prisoners gathered outside the prison awaiting more details, Notimex reported.