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Late Tuesday night, a collection of some of Syria's most powerful rebel brigades made an announcement: They declared their rejection of a moderate, Western-backed interim government and embraced Sharia law as "the sole source of legislation." The announcement marks a growing divide among the rebels and makes the U.S. wary of sending arms to the opposition. CNN's Barbara Starr reports on the al Qaeda-linked groups who are strengthening their influence and the dwindling number of moderates left on their own.