From The Washington Post:
On the eve of President Bush's Middle East trip, five Iranian patrol boats charged at three U.S. Navy ships entering the Persian Gulf on Sunday in what the Pentagon described as a "serious" provocation.
The high-speed Iranian boats, manned by Revolutionary Guards, dropped "white box-like objects" in the water that the U.S. ships evaded, according to Vice Admiral Kevin Cosgriff. "I am coming at you. You will explode in a couple of minutes," a radio transmission from one of the patrol boats warned.
The U.S. ships were preparing to fire at the Iranian vessels when the Iranians abruptly turned and sped away, U.S. officials said.