RAMSEY CANYON -- A sensor that went off in the Huachuca Mountains led U.S. Border Patrol agents from the Naco Station to find a large quantity of marijuana Tuesday night. Four illegal immigrants who denied they had anything to do with the marijuana also were taken into custody. Agents seized 777 pounds of marijuana, which has an estimated street value of $621,600. The Border Patrol launched a helicopter out of Libby Army Airfield in an attempt to round up other suspected drug smugglers, mules as they are called. At least 10 were able to successfully flee apprehension in the dark...