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 found an uncompleted 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 have shut down a more than half-mile tunnel linking Tijuana to San Diego with the help of U.S. Department of Homeland Security agents and Mexican law enforcement. Authorities have discovered nearly 100 illicit tunnels in the San Diego area since 1993.