Published: Mar 18, 2011 4:25 PM EDT
Updated: Mar 18, 2011 1:35 PM EDT

WASHINGTON- Secretary of State Hillary Rodham Clinton says Moammar Gadhafi has left the world no choice but to threaten military action against him.

Clinton, giving the first U.S. explanation of new U.N. authority for action against Libya, says the goal remains to get rid of Gadhafi. She says Gadhafi has refused repeated calls to stop killing civilians.

As for Friday's news that Libya would observe a cease-fire, Clinton says the U.S. will only be impressed with action, not words.

She provided no details of what military action would entail or when it might begin.

(Copyright 2011 by The Associated Press. All Rights Reserved.)