Iran releases footage of an incident in the Strait of Hormuz, following U.S. allegations that Iranian boats harassed and provoked three U.S. Navy ships on January 6.

The move comes a day after Iran's parliament speaker dismissed U.S. accusations that Iranian Revolutionary Guard boats threatened the U.S. ships as part of a "propaganda campaign" against the Islamic state.

Iran has described the contact in the Gulf as "routine", but U.S. President George W. Bush, speaking ahead of a Middle East trip on Tuesday, said Iran committed "a provocative act."

The U.S. has also released a video of the weekend encounter, including a recording of what it said was the exchange between the two sides.

Iran rejected the footage as fake and accused Washington of trying to stir up tension in the region. Iran's Revolutionary Guards said the images were archive pictures.