The Pentagon Tuesday released a four-minute, 20-second video of Sunday's incident, including video showing small Iranian boats swarming around U.S. warships in the Persian Gulf. In the audio recording, a man speaking in heavily accented English threatened, "I am coming to you. ...You will explode after ... minutes."
http://www.cnn.com/2008/WORLD/meast/01/09/iran.boats/index.html?iref=mpstoryview
In November the U.S. military reported that Iran's Revolutionary Guard Corps -- which the United States considers to be a major supporter of terrorist activity -- had taken command of Tehran's naval operations in the Persian Gulf, one of the world's key shipping regions and an area of high tension.