Incidente USA-Iran allo Stretto di Hormuz: il video
"There was video of the incident and it is in the process of being reviewed, There is some audio on the videotape also," said Colonel Gary Keck, a Pentagon spokesman.
Keck said he did not know whether the video would be released.
A Pentagon official, who spoke on condition of anonymity, said he understood that the audio portion of the tape includes the threat radioed by one of the Iranian vessels to blow up the US ships.
He said the video consists mainly of long shots of Iranian vessels in the water, but also captures the sounds of ship horns and communications in the bridge of the US ships.
The Pentagon charged Monday that five armed Iranian speedboats approached the USS Port Royal, the USS Hopper and the USS Ingraham at high speeds in international waters as they transited the Strait of Hormuz Sunday morning at 0400 GMT.
A US defense official, who asked not to be identified, quoted the Iranian radio transmission as saying: "I'm coming at you and you will blow up in a couple of minutes."
Pentagon officials said the Iranians also dropped white floating boxes into the path of the Ingraham, a guided missile frigate which passed by them without incident.
The US warships issued warnings and engaged in evasive maneuvers but no shots were fired during the encounter, which lasted less than 30 minutes, according to US defense officials.
Iranian officials played down the incident.
"What happened between the Guards and foreign vessels was an ordinary identification," Ali Reza Tangsiri, commander of the Iranian Revolutionary Guards' naval forces in the region, told the Mehr news agency.
He added that the Guards' naval forces had a right to monitor and identify "any vessel entering Persian Gulf waters" to the northwest.
Iranian state television quoted an unnamed Guards source in the region as saying that "no threatening message was transmitted" in Sunday's incident.