(Reuters) - At least five workers were injured in an explosion at a Washington state dam on Thursday, officials said, though the structural integrity of the dam was not threatened.
Kyle Foreman of the Grant County Sheriff's Office said the explosion occurred around 4:30 p.m. at the Priest Rapids Dam on the Columbia River, about 160 miles southeast of Seattle.
The five injured workers were transported to area hospitals by ground and air ambulance, Foreman said, though he did not know their conditions.
The cause of the explosion was being investigated. Further details on the incident were not immediately available.
(Reporting by Curtis Skinner in San Francisco; Editing by Eric Beech)