The U.S. military used a laser Thursday to shoot down a “seemingly threatening” drone flying near the U.S.-Mexico border. It turned out the drone belonged to Customs and Border Protection, lawmakers said.

The case of mistaken identity prompted the Federal Aviation Administration to close additional airspace around Fort Hancock, about 50 miles (80 kilometers) southeast of El Paso. The military is required to formally notify the FAA when it takes any counter-drone action inside U.S. airspace.

It was the second time in two weeks that a laser was fired in the area. The last time it was CBP that used the weapon and nothing was hit. That incident occurred near Fort Bliss and prompted the FAA to shut down air traffic at El Paso airport and the surrounding area. This time, the closure was smaller and commercial flights were not affected.

Washington U.S. Rep. Rick Larsen and two other top Democrats on the House Transportation and Infrastructure and Homeland Security committees said they were stunned when they were officially notified.