A cross-border drug-smuggling tunnel that was under construction was discovered Tuesday during a routine, bi-national inspection of the main storm drain system in Nogales and was shut down by authorities on both sides of the border, according to a news release.

Authorities found tools inside the ventilated 160-foot long tunnel that was roughly 2-feet wide and 3-feet tall. Investigators believe the tunnel, which was in the final stages of construction, would have exited on the U.S. side through a public parking lot located near the Dennis DeConcini port of entry, the release from Immigration and Customs Enforcement Homeland Security Investigations said.

About 153 feet of the tunnel was located in Arizona and seven feet were in Mexico, the release said.

A water line, storm drain pipe and two fiber optic lines were exposed inside the tunnel.

No people or drugs were found inside the tunnel and no arrests have yet been made in the case, which remains under investigation by the Nogales Tunnel Task Force.

Federal authorities have shut down six cross-border smuggling tunnels in the Nogales area in fiscal year 2013.

Senior Editor, News, Arizona Daily Star, Tucson, Az.