Authorities are trying to determine how a box of ammunition fell from a military helicopter and crashed through the roof of an elementary school in Texas.

The Ysleta Independent School District says no one was injured when the ammo box hit Parkland Elementary School in El Paso on Thursday afternoon. The ammo box left a hole in the roof and caused a power outage in part of the building.

The ammox box fell from a Black Hawk helicopter, Mike Brantley, a public affairs officer at Fort Bliss, told Business Insider.

Via Business Insider
Featured Image: U.S. Army Jumpmasters from the 3rd Military Information Support Battalion (MISB) meet at sunrise by a UH-60 Black Hawk to discuss the days Airborne operations, Dec. 5, 2014, at Fort Bragg, N.C. Airborne members of the 3rd MISB jump from various aircraft to maintain an active jump status and keep themselves mission ready. (U.S. Army photo by Spc. Kevin Sterling Payne/Released) (Fort Bragg/Flickr)