EL PASO, Texas (AP) — The Pentagon allowed U.S. Customs and Border Protection to use an anti-drone laser earlier this week, leading the Federal Aviation Administration to suddenly close the airspace over El Paso, Texas, on Wednesday, according to two people familiar with the situation who spoke on the condition of anonymity to discuss sensitive details.

The confusing arc of events began as the FAA announced it was shutting down all flight traffic over the city on the U.S.-Mexico border for 10 days, stranding some travelers, but the closure ended up only lasting a few hours. The Trump administration said it stemmed from the FAA and Pentagon working to halt an incursion by Mexican cartel drones, which are not uncommon along the southern border.

The Associated Press