With rockets roaring and guns blazing, more than a dozen swarming Iranian speedboats assaulted a replica of a U.S. aircraft carrier Wednesday during large-scale naval drills near the strategically vital entrance of the Persian Gulf.The nationally televised show of force by the country's elite Revolutionary Guard comes just weeks ahead of a deadline for Iran and world powers to forge a historic deal on the fate of Iran's nuclear program.Iranian live-fire war games are not uncommon. But by simulating for the first time an attack on the ultimate symbol of American naval power, Iran hoped to send a message that it has no intention of backing down to the U.S. whichever way talks over its contested nuclear program go."American aircraft carriers are very big ammunition depots housing a lot of missiles, rockets, torpedoes and everything else," the Guard's navy chief, Admiral Ali Fadavi, said on state television. A direct hit by a missile could set off a large secondary explosion, he added.Fadavi last month boasted that his force is capable of sinking American aircraft carriers in the event of war. He previously called carriers easy targets and said Iran naturally wants to sink them.The drill, named "Great Prophet 9," was held near the Strait of Hormuz, through which about a fifth of the world's oil passes. Iran's regular army carried out naval drills near the strait in December.Tensions near the strait have caused oil prices to spike in the past good news for producers like Iran. But traders seemed to take Wednesday's maneuvers in stride, with benchmark U.S. crude dipping slightly and continuing to hover below $50 a barrel by mid-morning.

State TV showed footage of missiles fired from the coast and the fast boats striking the ersatz American carrier, which appeared to be a replica seen in a shipyard in the southern port of Bandar Abbas last year. The drills also included Guard forces shooting down a drone and planting undersea mines.

Footage aired Wednesday did not show that the assault had managed to sink the mock-up, but it was heavily damaged.The Guard's chief commander, Gen. Mohammad Ali Jafari, said the drills send a "message of (Iran's) might" to "extraterritorial powers," a reference to the United States.Cmdr. Kevin Stephens, the spokesman for the U.S. Navy's 5th Fleet in Bahrain, said the Americans were monitoring the drills, which had no effect on maritime traffic. He downplayed the simulated attack on the carrier, saying the U.S. military was "not concerned about this exercise.""We're quite confident of our naval forces' ability to defend themselves," he said. "It seems they've attempted to destroy the equivalent of a Hollywood movie set."The U.S. routinely stations at least one aircraft carrier and other warships in and around the Gulf.It and its allies conduct periodic naval exercises of their own in the region, including ones aimed at countering the threat from undersea mines that could be used to block ship traffic through the strait.The American aircraft carrier USS Carl Vinson is currently deployed in the Gulf, as is the French carrier Charles de Gaulle. Planes from both vessels are carrying out airstrikes against the self-proclaimed Islamic State of Iraq and al-Sham (ISIS) group, which has seized roughly a third of Iraq and Syria.Iran backs Syria's government and is supporting Iraq in its fight against the militants, but it is not part of the U.S.-led international coalition against the extremist group.The drills were not publicly announced in advance, but the Guard has held similar military exercises around this time of year. The last one, in February 2013, featured "suicide drones" that attack enemies kamikaze-style.The Guard, which has a 200,000-strong force, is different from the regular army and is charged with protecting the ruling system. It also controls the paramilitary Basij militia, for which there are no precise personnel figures available.Iran put the Guard in charge of defending the countrytarget="_blank"'>