PARIS (AP) -- U.S. Secretary of State Hillary Rodham Clinton said Saturday that the U.S. will bring "unique capabilities to bear" in Libya as a global coalition began enforcing a U.N.-authorized no-fly zone to protect civilians from Moammar Gadhafi's forces. The world will not "sit idly by," she said at a news conference, amid fears that Gadhafi will commit "unspeakable atrocities" against his people.