On May 21st, 2011, the local police station in Ciudad Valles, San Luis Potosí, Mexico was attacked by drug cartel gunmen. At about 7:30 am, officers were arriving to start their shift when 20 to 30 cartel gunmen in vehicles arrived and attacked the headquarters with machine guns and hand grenades. One police officer was killed and another seriously wounded in the attack. The attack was caught on camera by a bystander.
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