State police said the Monday assault took place on the outskirts of Torreon, an industrial city in the border state of Coahuila.
In June last year, 13 people were killed at a rehab center in the same city.
Gang members sometimes seek shelter at rehabilitation centers, making other patients targets of drug cartels.
Coahuila has experienced rampant violence fueled by a turf war between drug gangs fighting for control of smuggling routes into the United States.
Drug wars in Mexico have claimed 55,000 lives and more than 5000 gone missing since 2006 when President Felipe Calderon launched a crackdown on criminal gangs.
Last Month, the bodies of 43 men and 6 women, some of them mutilated, were found in plastic bags on a highway connecting the northern metropolis of Monterrey to the US border.
PG/JR
source: Presstv.ir – American News
Police officers stand at a drug-related crime scene in Mexico City. (file photo) Wed May 15, 2013 8:16PM Share | Email | Print Six men have been shot to death when a gang of assailants armed with assault rifles opened fire in a used car lot in the northern Mexican city of Ciudad Juarez, officials
Beate Zschaepe (C) arrives at a court in Munich, Germany, May 6, 2013. She is the main defendant of an alleged neo-Nazi group in the murder case of ten immigrants between 2000 and 2007. Mon May 6, 2013 10:29AM Share | Email | Print Beate Zschaepe, 38, is charged with complicity in the murder of
A soldier of the Mexican Army patrols outside a school during a security operation in Acapulco, Mexico (file photo). Sun May 5, 2013 8:47PM Share | Email | Print At least 11 people, including a soldier, have been killed in three clashes between gunmen and security forces in Mexico’s northeastern state of Tamaulipas, officials have