TIJUANA (CBS 8) - Mexican authorities are investigating a drug tunnel in Tijuana which was discovered on Tuesday.
The tunnel was found inside a home less than a mile from the Otay Mesa Port of Entry. Mexican police made the discovery and now federal authorities from San Diego are there to help with the investigation.
Nine people were detained following the discovery.
Tuesday's discovery of a drug tunnel near the Mexico-US border is one of dozens that have been located over the past decade. In this case, the tunnel was found still under construction. It measured about the length of one and a half football fields, just west of the Tijuana airport.
"Since 2006, there have been approximately 80 cross border tunnels discovered on the U.S.-Mexico border and the majority have been discovered here in the San Diego or the California-Arizona border area," said Lauren Mack with U.S. Immigration and Customs Enforcement.
Federal authorities say the area has been targeted by cartels, but usually the tunnels are built underneath warehouses and not homes.
The tunnel was well-equipped with both lighting and ventilation. Officers confiscated a truck that was being used to construct the tunnel. According to Mexican officials, only trace amounts of meth were found in the tunnel, along with two bricks of marijuana.
The tunnel will remain under constant guard until the investigation is complete.
U.S. Immigration and Customs Enforcement representatives says it's up to the Mexican authorities to determine what to do with the tunnel. In most cases, the tunnels are filled with cement so they can't be used.