NEW : `` It 's not a good day for the cartels , '' says ICE director John Morton . NEW : Smugglers were caught in the act , John Morton says . A 600-yard tunnel connected warehouses in U.S. and Tijuana , officials say . Agents followed the truck to a Border Patrol checkpoint at Temecula , California , and authorities found 10 tons of marijuana hidden in cardboard boxes on pallets , said ICE director John Morton . 26 tons of smuggled marijuana were found on the U.S. side and 10 in Tijuana .
NEW : `` It 's not a good day for the cartels , '' says ICE director John Morton . NEW : Smugglers were caught in the act , John Morton says . A 600-yard tunnel connected warehouses in U.S. and Tijuana , officials say . 26 tons of smuggled marijuana were found on the U.S. side and 10 in Tijuana .