By Allan Lengel

Drug tunnels continue to pop up along the U.S.-Mexican border.

The latest: The Associated Press reports that authorities discovered in Nogales, Az., a fairly sophisticated 250-foot-long unfinished tunnel underneath the U.S.-Mexico border that had electricity, water pumps and ventilation.

AP reported that Chief Border Patrol Agent Randy Hill says the tunnel was more sophisticated than others recently unearthed and that the builders had to chisel through solid rock.

AP reported that the tunnel was 15 feet beneath the ground. It started in an abandoned building in Nogales on the Mexican side and was still undergoing construction on the American side.