A cross-border tunnel was discovered just south of the the U.S.-Mexico border, U.S. Immigration and Customs Enforcement's (ICE) Homeland Security Investigations (HSI) Tunnel Task Force confirmed Thursday.

A number of Mexican law enforcement agencies surrounded the business near Tijuana Airport after reports that a drug tunnel was found.

The business is along Boulevard Cuauhtémoc Norte near Olivos, 500 meters south of the border and the main route to the Tijuana International Airport.

The location is less than five miles southeast of the Otay Mesa Port of Entry.

State, federal police and military officers surrounded the business, which sells ice.

The street is the same one where a tunnel was found last February, officials said.

"In order to ensure the integrity of the ongoing investigation and the safety of those involved, HSI San Diego is not providing additional details at this time," a spokesperson told NBC 7.

An NBC 7 news crew discovered a U.S. Border Patrol agent security at a warehouse on the U.S. side of the border Thursday afternoon.

https://twitter.com/WendyNBCSD/status/789187775203450882

https://twitter.com/WendyNBCSD/status/789221762726711296

The Tijuana International Airport is connected to the U.S. through a 390-foot pedestrian bridge.

The cross-border terminal was built to service an estimated two million travelers.

The bridge was designed to decrease the wait for Americans flying in and out of Tijuana airport to about 30 Mexican destinations.

[DONT CHANGE MAIN HEADLINE] San Diego's Border Busts