At approximately 3:45 p.m. on Thursday, a UH-60 Blackhawk Helicopter out of Fort Bliss dropped an ammo box from an altitude of approximately 1,000 feet through the roof of an elementary school during a training exercise over El Paso, Texas. An investigation into the incident has been launched.

Parkland Elementary School reported no injuries in the incident, though the ammo box left a hole in the roof and caused portions of the building to lose power. Because the incident occurred after classes had ended for the day, there were no students in vicinity of the impact when it occurred, though damage was reported in at least one classroom. Officials from Fort Bliss were on the scene within 30 minutes to recover the ammunition. Their statements indicated that the ammo can weighed approximately 40 pounds, but carried enough force to cause serious damage due to the height that it fell.

Although some parents expressed concerns about potential “detonation” of the ammunition in the fall, Fort Bliss officials have been clear that there was no threat of rounds being ignited or otherwise fired in the incident.

“I’m extremely sorry for any damage done to the neighboring elementary school, and I am grateful that no one was injured,” Col. Jay Hopkins, commander of the 1st Armored Division Combat Aviation Brigade, said in a statement. “The incident is under investigation.”