According to local media reports, gunmen arrived the building in a white sedan and began shooting with AK-47s at a drug rehabilitation centre in the city of Chihuahua.
About 25 people were present in the centre when the shooting occurred.
Over a dozen police vehicles have been deployed around the centre and police officers were searching for the attackers in nearby areas.
The state of Chihuahua, which borders the US, has seen some of the worst violence in Mexico's decade-long war on drugs.
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