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Too little is known about Libya's rebels and they remain too fragmented for the United States to get seriously involved in organizing or training them, let alone arming them, U.S. and European officials say.

U.S. and allied intelligence agencies believe NATO's no-fly zone and air strikes will be effective in stopping Muammar Gaddafi's forces from killing civilians and dislodging rebels from strongholds like Benghazi, the officials say.