The U.S. military says one of its Black Hawk helicopters has gone down near Afghanistan's capital. No deaths were reported.

All seven people aboard survived and the military says in a statement that they are "safe and secure."

The statement does not say what caused the accident, but does say that no enemy activity was involved. The helicopter was on its way to perform a medical evacuation when it went down Friday morning.

The military says the incident is under investigation.