Said a senior military official said the attack will unfold in stages and installations targeted air defense around Tripoli, the capital, and the coastal region south of Benghazi. This is the stronghold of the rebels to attack by the forces of Muammar Gaddafi.
Did not have full details were not immediately available, although the Pentagon said a missile fired 112 Tomahawk cruise ships from U.S. and British warplanes off the Libyan coast.
The official spoke on condition of anonymity to discuss sensitive military operations.
The United States began just hours after Secretary of State Hillary Rodham Clinton attended an international conference in Paris, which supported military action against al-Gaddafi, attacks on Libya's air defense missile and radar sites along the Mediterranean coast for the protection of the no-fly pilots the region from the threat of getting shot down .
President Barack Obama authorized limited military action against Libya on Saturday, saying the attack was Muammar Gaddafi continued on his own people and left the United States and its international partners with no other option. The Pentagon said it fired 110 cruise missiles on 20 goals.
Obama said military action was not first choice.
"This is not the result the United States or any of the partners sought," Obama said of Brazil, where he began a five-day visit to Latin America. "We can not stand idly by when a tyrant to his people say there will be no mercy."
The senior military official said the United States launched air defenses Saturday with strikes along the Libyan coast launched by Navy ships in the Mediterranean Sea. The official said the attack would unfold in stages and installations targeted air defense around Tripoli, the capital, and the coastal region south of Benghazi, a stronghold of the rebels.
Obama said again that the United States would not send ground troops to Libya, though he said he was "deeply aware of" the risk of any military action.
In a press conference in Paris, Clinton said Gaddafi had left the world no choice but to intervene quickly and forcefully to protect further loss of civilian lives.
"We have every reason to fear that the left-Qadhafi has not been verified that the perpetration of unspeakable atrocities," she told reporters.
Between U.S. Navy ships in the Mediterranean and two destroyers guided missiles, and Barry and USS USS Stout, as well as two warships, amphibious, and Kearsarge USS USS Ponce, and ship command and control, and Mount Whitney, USS. The submarine USS Providence also in the Mediterranean region.