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Thirteen members of a drug rehabilitation center and two bystanders were shot to death near a car wash in Tepic, Nayarit, according to various news accounts.
Reports say the victim were from the Alcance Victoria (Victory Outreach) rehabilitation center and were working at the car wash as a part of their recovery program.
Armed suspects drove to the scene aboard two SUV, dismounted with assault rifles and started shooting.
Two bystanders, a fruit vendor and a recently arrived customer were caught in the gunfire and died at the scene.