Military officials are investigating why a jet fighter dropped a 25-pound practice bomb on a Pennsylvania hiking trail.
No one was injured when the cast-iron bomb accidentally fell about 10,000 feet earlier this month. But one hiker was close enough to hear the thud.
The grapefruit-sized bomb left a crater about six inches wide in the trail, which runs along an abandoned rail line near Fort Indiantown Gap.
A military spokesman said two A-10 Thunderbolts were flying a routine training mission when one jet dropped a bomb about a mile from its intended target.
The jet has since been grounded. Investigators said they've ruled out pilot error.