Mexico lawmakers demand answers about guns smuggled under ATF's watch

Lawmakers in Mexico are demanding an investigation into a U.S. law enforcement operation that allowed hundreds of weapons to flow into the hands of Mexican drug cartels amid claims from a ranking legislator that at least 150 Mexicans have been killed or wounded by guns trafficked by smugglers under the watch of U.S. agents. U.S. authorities say manpower shortages and the high number of weapons sold resulted in their losing track of hundreds of guns, from pistols to .50-caliber sniper rifles, though a federal agent deeply involved in the Phoenix-based operation said it was "impossible" that U.S. authorities did not...