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Mexican authorities say gunmen shot down a police helicopter in western Mexico, killing the pilot and three officers.
The governor of the western state of Michoacán wrote on his Twiiter account that a fourth officer was wounded.
Gov. Silvano Aureoles said the attack occurred Tuesday in a "hard-to-access" area near the Michoacán city of Apatzingán. The area has been a hotbed of drug cartel activity and was the scene of fights between the gangs and armed vigilante groups.
It was the worst death toll in an assault on a helicopter in Mexico since a May 2015 attack in the neighboring state of Jalisco. In that incident, cartel gunmen shot down an army helicopter with a rocket launcher, killing 10.
