Arleigh Burke-class guided-missile destroyer USS Barry (DDG 52) launches a Tomahawk missile in support of Operation Odyssey Dawn in the Mediterranean Seain this handout photo March 19, 2011. This was one of approximately 110 cruise missiles fired from U.S. and British ships and submarines that targeted about 20 radar and anti-aircraft sites along Libya's Mediterranean coast. Joint Task Force Odyssey Dawn is the U.S. Africa Command task force established to provide operational and tactical command and control of U.S. military forces supporting the international response to the unrest in Libya and enforcement of United Nations Security Council Resolution (UNSCR) 1973. [Xinhua/AFP Photo]

The United States Saturday launched the first Tomahawk missile attacks against the Libyan air defense from warships deployed in the Mediterranean, the Pentagon said.

Speaking in condition of anonymity, a senior U.S. military official said the strikes targeted air defense sites along the Libyan coast. The sites were around Libyan capital Tripoli and western region of Misrata. The official said the strikes were the first stage of the assault that would involve U.S. Navy ships and planes.

The U.S. Navy has three submarines outfitted with Tomahawk missiles in the Mediterranean, as well as two guided-missile destroyers, and two amphibious warships, and a command-and-control ship, according to officials who spoke on condition of anonymity. The military also has five surveillance planes in the area.

Pentagon officials said earlier they intended to limit the military's involvement in Libya mainly to help and protect foreign aircraft flying into Libyan air space.

According to the Pentagon, five nations including the United States, France, Britain, Canada and Italy are participating in the strikes, and the coalition has 25 ships in the Mediterranean.