(CNN)Authorities are investigating if criminals were involved in a police helicopter crash that killed four people in southwestern Mexico, a local governor said.
Three police officers and a pilot died Tuesday when the aircraft went down in Michoacan state, Gov. Silvano Aureoles tweeted.
At the time, Aureoles tweeted that criminals downed the aircraft. But in a later interview with CNN affiliate Televisa, he said he “cannot confirm that it was taken down, or shot down.”