NEW : `` It 's not a good day for the cartels . The sophisticated tunnels -- with lighting , oxygen pumps and rail lines -- are typically used to ferry drugs from Mexico to the United States . NEW : Smugglers were caught in the act , Morton says . A 600-yard tunnel connected warehouses in Tijuana and San Diego , officials say . 26 tons of smuggled marijuana were found on the U.S. side and 4 in Mexico .
NEW : `` It 's not a good day for the cartels . NEW : Smugglers were caught in the act , Morton says . A 600-yard tunnel connected warehouses in Tijuana and San Diego , officials say . 26 tons of smuggled marijuana were found on the U.S. side and 4 in Mexico .