Trying To Provoke A War

It has been apparent for some time that Iran wants a war with the U.S. This recent account from CNN suggests that the recent National Intelligence Estimate that concluded that there was not a current nuclear weapons program has reduced the Iranians to more direct efforts to start a war:

U.S. military officials said the incident occurred early Sunday morning in the Strait of Hormuz, a narrow shipping channel leading in and out of the Persian Gulf.
They said that as the guided missile destroyer USS Hopper, the guided missile cruiser USS Port Royal and the guided-missile frigate USS Ingraham were entering the Persian Gulf, five Iranian boats approached them at high speed and swarmed them.
The Iranian boats made "threatening" moves toward the U.S. ships and in one case came within 200 yards of one of them, the U.S. officials said.

The U.S. Navy also received a radio transmission that officials believe came from the Iranian boats. The transmission said, "I am coming at you. You will explode in a couple of minutes," the U.S. military officials told CNN.
When the U.S. ships heard that radio transmission, they took up their gun positions and officers were "in the process" of giving the order to fire when the Iranians abruptly turned away, the U.S. officials said.
After the radio transmission, one of the Iranian boats dropped white boxes into the water in front of the U.S. ships, the officials said. It was not clear what was in the boxes, the officials said.

No shots were fired, and no one was injured.

A Pentagon spokesman characterized the incident as "perplexing" and "cause for real concern."
"Such actions are dangerous and could have quickly escalated into something much worse," said Geoff Morrell, Pentagon press secretary. "We see it as further evidence that Iran is unpredictable and remains a threat."

The article also reports that the Revolutionary Guards have "taken command of Tehran's naval operations in the Persian Gulf." This is worrisome. Iran has a long history of supporting terrorism directed at the United States.