On Tuesday night, the Federal Aviation Administration closed airspace up to 18,000 feet above the El Paso International Airport in Texas, saying the restrictions would be in place for 10 days. Then, less than 10 hours later, the federal agency reopened the airspace, allowing planes to land and take off at the busy airport.

About an hour after lifting the restrictions, US Secretary of Transportation Sean Duffy, whose responsibilities include overseeing the FAA, explained the unexpected closure by saying, “The FAA and DOW acted swiftly to address a cartel drone incursion.” (The Trump Administration refers to the Department of Defense as the Department of War, or DOW, although its legal name remains the former.)

Not everyone agrees with Duffy’s account.

Based upon reporting from The New York Times and other publications, the military has been developing high-energy lasers to bring down drones. The FAA and US military officials had been discussing tests of the new weapon from the nearby Fort Bliss Army base. However, the FAA had not resolved all of its concerns about airplane safety from the tests.

Despite these apparently lingering concerns from the FAA, the military went ahead with a test earlier this week against what was thought to be a drone. The object was a party balloon.