Mexico raids underground tunnel into the U.S.

/ Source: NBC News and news services

More than a dozen people were arrested Wednesday after Mexican authorities found an underground tunnel extending from Tijuana into the United States.

The tunnel, measuring just under 1,000 feet in length and reaching a depth of 90 to 100 feet, did not have an entry point in the United States, according to Drug Enforcement Agency, which issued a statement on the discovery. The passageway extend more than 860 feet across the border.

Although incomplete, the tunnel has lighting, electrical and ventilation systems and is equipped with an elevator, according to federal officials. When Mexican authorities entered the passageway Wednesday morning in Tijuana, they found more than a dozen people, all believed to be Mexican citizens.

"The discovery of this unfinished tunnel bears witness to the extraordinary cooperation between all agencies involved in the task force and the government of Mexico," said Drug Enforcement Administration Special Agent in Charge Ralph W. Partridge.

Initial reports indicate the tunnel had been under construction for approximately two years. So far, there have been no arrests in the United States, but the investigation is ongoing.

Mexican authorities raided the tunnel after getting information provided by federal investigators from the multi-agency San Diego Tunnel Task Force.