The United States has a host of forces and ships in the region, including submarines, destroyers, amphibious assault and landing ships with some 400 Marines, but U.S. officials have not said what role American participation will take. the United States "is not going to deploy ground troops into Libya."
U.S. Secretary of State Hillary Rodham Clinton said the United States must see "action on the ground," not just words, on a cease-fire.
British defense analyst Charles Heyman said the Americans will have the bulk of the military responsibility.
"It's easy for the British and the French to talk a lot about it when they actually don't have all the right equipment to maintain a no-fly zone on their own," Heyman said.
Britain, France and NATO held emergency meetings Friday on using military force to enforce the no-fly zone, which was approved by U.N. Security Council on Thursday.
French Foreign Minister Alain Juppe said "everything is ready" for action, but added that "we have to analyze the conditions of the cease-fire."
NATO Secretary-General Anders Fogh Rasmussen said NATO was "completing its planning to be ready to take appropriate action in support of the U.N. resolution as part of the broad international effort."
French government spokesman Francois Baroin would not comment on "where, how, what target, or in what form" air strikes against Libyan installations would come.
Officials announced that the leaders of Britain, France and Germany and the chiefs of the United Nations and Arab League would join other world leaders for an emergency summit on Libya in Paris Saturday.
U.N. Secretary General Ban Ki-moon said "it is imperative that the international community continues to speak with one voice" on Libya.