The incomplete drug smuggling tunnel, which extended more than 1,000 feet inside the U.S., was actively under construction when Border Patrol agents discovered it. SAN DIEGO — U.S. Border Patrol agents found a drug smuggling tunnel linking San Diego and Tijuana in early April, the agency said in a press release on Wednesday.

U.S. Border Patrol agents shut down the construction of a 2,918-foot-long tunnel connecting Tijuana and San Diego with the aid of Department of Homeland Security officials and Mexican authorities.

U.S. Border Patrol agents have discovered and disabled a highly sophisticated, large-scale drug smuggling tunnel running from Tijuana, Mexico, into the Otay Mesa area of San Diego, authorities announced Wednesday.