IS Syria stronghold Raqqa next after Manbij operation is completed - U.S. official

A member loyal to Islamic State waves a flag in Raqqa June 29, 2014. To match Special Report RUSSIA-MILITANTS/ REUTERS/Stringer/File Photo

WASHINGTON (Reuters) - Once the operation against the Islamic State-held city of Manbij in northern Syria is completed, that creates the conditions to move on the militant group's main stronghold of Raqqa, Brett McGurk, U.S. President Barack Obama's special envoy in the fight against Islamic State said on Tuesday.

"The Manbij operation, it's ongoing on right now, it's hard fighting, once that is done, that sets the conditions for Raqqa," McGurk told a U.S. Senate Foreign Relations Committee hearing.