**At least 23 inmates have been killed after a fight at a jail in Durango in northern Mexico, say officials.**Police believe the inmates were members of rival drugs gangs, said the Reuters news agency.
But prison spokeswoman Carla Puente was quoted by the Associated Press as saying she did not know the cause of the fighting.
Thousands of people have been killed in drug-related violence in Mexico over the past few years.
“There are 23 dead, all inmates,” Durango army head General Moises Melo Garcia told Reuters.
Ms Puente said some people had also been injured in the brawl, which she said was ended by prison guards.