LA PAZ - Four UN anti-drug workers and two Bolivian pilots were found dead after their plane crashed in western Bolivia on Friday, authorities said Saturday.

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The Cessna small aircraft went missing after it left for a mission to monitor the country's coca-growing area north of the capital of La Paz.

Because the plane went down in a deep forest, it took two days for the rescuers to finally get to its wreckage. Bolivian authorities said it appeared that the aircraft had hit a tree.