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Drug lord Arturo Beltran Leyva killed in Mexico

GlobalPost joins the Mexican army on the front lines as it tracks down drug cartels.

Navy special forces stand guard during a navy operation in Cuernavaca, in the Mexican state of Morelos, Dec. 16, 2009. Arturo Beltran Leyva, one of Mexico's most wanted drug traffickers, was killed in a shoot out with state security forces during the same operation on Wednesday, the navy said. (Margarito Perez/Reuters)

SINALOA, Mexico — One of Mexico's most wanted drug lords was killed Wednesday in a gun battle with Mexican security forces.

Arturo Beltran Leyva — who called himself the "boss of bosses" — headed a powerful cartel based on the Pacific Coast. The government had offered a $2.4-million reward for his capture.

GlobalPost had a rare opportunity to join the 94th battallion of the Mexican army to see its work fighting the drug cartels. Watch as the army locates a marijuana field in the Sierra Madre mountains and sets up impromtu checkpoints during an urban operation.