A man suspected of making a tape-recorded threat to blow up Bonneville Dam later showed up at the federal facility with a gun and was shot to death by an FBI agent, authorities said.
No explosives were found at the dam, said Diana Brimhall, a spokeswoman for the U.S. Army Corps of Engineers, operator of the sprawling hydropower installation on the Columbia River along the Oregon-Washington state line.
The man with the gun was a local resident in his teens or 20s, Coroner Bradley Andersen said. His name was withheld by authorities.
The bomb threat was found at about 4 p.m. Sunday on a tape recorder near a telephone at the visitor center on the Washington side of the dam, Ms. Brimhall said.
A man with a gun later showed up and, after a confrontation, was shot by an FBI agent between 6:30 and 7 p.m., Oregon State Police Lt. Gregg Hastings said. No one else was injured.