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Picture of the wreckage of a helicopter that was involved in a police operation and was allegedly shot down by drug traffickers, taken late on September 6, 2016 in La Huacana, Michoacan State, Mexico.
A police helicopter crashed Tuesday during an operation to capture suspected gang leaders in western Mexico, and authorities were investigating whether gunmen shot it down, killing three officers and the pilot. / AFP / ENRIQUE CASTRO        (Photo credit should read ENRIQUE CASTRO/AFP/Getty Images)
Picture of the wreckage of a helicopter that was involved in a police operation and was allegedly shot down by drug traffickers, taken late on September 6, 2016 in La Huacana, Michoacan State, Mexico.
A police helicopter crashed Tuesday during an operation to capture suspected gang leaders in western Mexico, and authorities were investigating whether gunmen shot it down, killing three officers and the pilot. / AFP / ENRIQUE CASTRO        (Photo credit should read ENRIQUE CASTRO/AFP/Getty Images)

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    Criminals suspected in helicopter crash

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Criminals suspected in helicopter crash

Investigators are trying to determine whether criminals were involved in a helicopter crash in Mexico that killed four, including three police officers.

Criminals suspected in helicopter crash

Investigators are trying to determine whether criminals were involved in a helicopter crash in Mexico that killed four, including three police officers.