Mexican Federal Police officers show April 14, 2009 to the press at their Command Center in Mexico City, a Browning .50 antiaircraft machine gun mounted on a van seized on the eve at a house in Sonora, northern Mexico, near the US border. Police also found a grenade launcher, five shotguns, a hand grenade, and scores of magazines and cartridges. A suspected female caretaker was also detained, authorities said.