Border patrol agents have uncovered a tunnel leading from the kitchen of an old KFC restaurant to a trap door in a bedroom in Mexico. Officials believe the tunnel between San Luis, in Arizona, and San Luis Río Colorado, in Sonora, was used for smuggling drugs.

Police say they were tipped off in April about the existence of a tunnel leading to the abandoned restaurant. They began monitoring its owner, Ivan López, and stopped him in his vehicle earlier this month. Officers found 160kg of hard drugs worth more than $1m