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.

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.

Border Patrol agents have provided a better look inside the sophisticated cross-border tunnel discovered in early April, which stretches approximately half a mile from Tijuana to San Diego.