Syrian Rebels Move to Reclaim Raqqa From ISIS

A U.S.-backed Syrian coalition has announced a campaign to reclaim Raqqa, the unofficial capital for ISIS.

The Syria Democratic Forces announced the campaign on Sunday, three weeks after U.S.-backed Iraqi forces launched an effort to retake Mosul.

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U.S. Defense Secretary Ash Carter said he welcomed the announcement.

"The effort to isolate, and ultimately liberate, Raqqa marks the next step in our coalition campaign plan," Carter said in a statement.