TEHRAN — Iran’s Revolutionary Guard accused the United States on Wednesday of fabricating video showing armed Iranian speedboats confronting United States Navy warships in the Persian Gulf over the weekend, according to a report carried by the semi-official Fars news agency as well as state-run television.

“Images released by the U.S. Department of Defense about the navy vessels, the archive, and sounds on it are fabricated,” an unnamed Revolutionary Guard official said, according to Fars. The news agency has close links to the Revolutionary Guard. It was the first time Iran had commented on a video the Pentagon released Tuesday.

The unnamed Revolutionary Guard official asserted that the video had been released to coincide with Mr. Bush’s trip and “was in line with a project of the Western media to create fear.” The official said the sounds and the images on the video did not go together. “It is very clear that they are fake,” the official said.