A clash between rival gangs in a prison in Mexico’s north-western state of Sinaloa has left some 28 inmates dead, informs BBC News Tuesday.
The violence came as dozens were killed on another day of apparent drug-related violence in Mexico.
In the western state of Michoacan, 12 police officers were killed in an ambush by suspected drug cartel gunmen.
Both Michoacan and Sinaloa are home to rival drug gangs that have been fighting turf wars and battling security forces.
At least 23.000 people have been killed in drug-related violence in Mexico since December 2006, when President Felipe Calderon ordered the army and federal police to combat the cartels.
On Friday, nearly 40 people were killed in two separate attacks blamed on drugs gangs – one in Ciudad Juarez on the US border, the other in Ciudad Madero in north-eastern Tamaulipas state.