Three World War I-era 25-pound Cooper bombs intended to be dropped from airplanes were among unexploded ordnance dug up this week from the golf driving range at Bellows Air Force Station, officials said.

1st Lt. Robert Howard, a Pacific Air Forces spokesman, said one of the bombs had a fuse and was detonated in place at about 4 p.m. Thursday along with another of the bombs which was inert and had no explosives.

Demolition experts determined the third bomb was not dangerous. 

The detonation of the 25-pound Cooper bomb with the explosives caused little damage even to plywood covering the blast, Howard said. A contractor used RDX, a material that penetrates the bomb and slowly builds up heat to trigger any explosive material contained within, to neutralize the ordnance.