WASHINGTON – The Pentagon is stepping up aid for Mexico's bloody drug war with a new U.S.-based special operations headquarters to teach Mexican security forces how to hunt drug cartels the same way special operations teams hunt al-Qaida, according to documents and interviews with multiple U.S. officials.

Such assistance could help newly elected Mexican President Enrique Pena Nieto establish a military force to focus on drug criminal networks that have terrorized Mexico's northern states and threatened the Southwest border. Mexican officials say warring drug gangs have killed at least 70,000 people between 2006 and 2012.

Based at the U.S. Northern Command in Colorado, Special Operations Command-North will build on a commando program that has brought Mexican military, intelligence and law enforcement officials to study U.S. counterterrorist operations from the U.S. to the war zones, to show them how special operations troops built an interagency network to target al-Qaida mastermind Osama bin Laden and his followers.