Search of Nogales home yields anti-tank explosive, grenades NOGALES, Sonora - U.S. and Mexican officials are investigating a heavy weapons cache discovered in this border town that police believe was headed south to arm drug cartels. In a late Wednesday search of a Nogales home, police found an anti-tank warhead, six hand grenades and more than 1,200 rounds of ammunition, Nogales Police Chief Ramses Arce Fierro said Friday. Officers also found an empty missile tube for a larger sized shoulder-fired weapon, he said. A task force of FBI and Bureau of Alcohol, Tobacco, Firearms and Explosives agents were working with...