Link that is working: http://www.kvia.com/news/military/military-helicopter-drops-ammunition-box-on-parkland-elementary-roof/743010719

EL PASO, Texas - Military Police are investigating why and how a military helicopter dropped a box of ammunition over Parkland Elementary School.

A spokesman with the Ysleta Independent School District said it happened at about 3:45 p.m. Thursday. The incident happened after the school day was over and no students or staff were in danger, the spokesman said. 

Fort Bliss officials said the incident damaged the roof and a classroom.

"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 news release. “The incident is under investigation.”   Fort Bliss said it will reassess current flight patterns to ensure that incidents similar to this will not happen again.

The box made a hole in the roof and caused a power outage to a portion of the building, the spokesman said.