The FBI bulletin said the Earth Liberation Front reportedly was planning a "day of action and solidarity" that could include acts of ecoterrorism, according to Tor Bjornstad, a police commander in Olympia, one of several cities named as possible targets.
Some of the others were Eugene; Oregon; San Francisco; Modesto, California; Morgantown, West Virginia; Portland, Maine; Worcester, Massachusetts; Lake Worth, Florida; and Lawrence, Kansas, Bjornstad said.
The general warning was part of a weekly intelligence bulletin the FBI distributed to some 18,000 law enforcement agencies on Wednesday, said Bill Carter, a spokesman in the FBI's Washington, D.C., headquarters.
No specific targets were identified in the bulletin, Bjornstad said. He said his department contacted what it considered potential targets, including auto dealerships, building contractors and the Port of Olympia, which exports timber.
"We have to take it seriously, and one of the reasons is that this group has claimed credit for a fair amount of criminal activity in the past several years," Bjornstad said.