Drug lord Arturo Beltran Leyva killed in Mexico

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.