Legal action is being taken against a Web site operator who has misrepresented the U.S. Geological Survey in a warning that the area around Yellowstone National Park should be evacuated out of concern that the park's supervolcano could erupt.

"We started to take action as soon as we found out about it," said Jessica Robertson of the USGS, adding that the agency was notified on Friday.

The issue has been referred to the USGS's solicitor's office which is pursuing charges of impersonating a federal official as well as violation of the agency's trademark.

"Somebody went to some effort to make themselves look legitimate and put out a warning," Nash said. "We're concerned because it looks legitimate. It looks pretty official."



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