An anti air-craft machine gun, the first weapon of its kind seized in Mexico, is displayed to the media at a police base in Mexico City, Tuesday, April 14, 2009. Police on a routine patrol detained a 20-year-old woman guarding an arsenal, allegedly belonged to a group linked to the powerful Beltran Leyva drug cartel, at a house in northern Sonora state. AP Photo logo AP Photo 10 months ago

An anti air-craft machine gun, the first weapon of its kind seized in Mexico, is displayed to the media at a police base in Mexico City, Tuesday, April 14, 2009. Police on a routine patrol detained a 20-year-old woman guarding an arsenal, allegedly belonged to a group linked to the powerful Beltran Leyva drug cartel, at a house in northern Sonora state.