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

Arleigh Burke-class guided-missile destroyer USS Barry (DDG 52) launches a Tomahawk missile in support of Operation Odyssey Dawn in the Mediterranean Sea in this handout photo March 19, 2011. This was one of approximately 110 cruise missiles fired from US and British ships and submarines that targeted about 20 radar and anti-aircraft sites along Libya's Mediterranean coast. [Photo/Agencies]

Speaking in condition of anonymity, a senior US 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 US Navy ships and planes.

Related readings:  Libya declares cease-fire after UN resolution vote  Gadhafi's forces fire on rebel-held Misrat  Gadhafi forces push into rebel stronghold  Benghazi hospital has 26 dead after attack-TV

The US 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.