A fire burned about 100 acres of the Army’s Makua Valley training range Wednesday after it was started by workers who had detonated unexploded ordnance.

An Army spokesman said the detonation was part of a routine, ongoing cleanup operation. No one was injured. The fire was contained about 4 p.m.

No threatened or endangered species or native Hawaiian cultural sites were affected, according to an Army cultural resoucre official at the scene, the Army said.

Army personnel, federal firefighters and contract helicopter fire suppression supprt worked to contain the fire.

There has been no training or live fire operations in Makua since 2004 because of ongoing lawsuits.