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Coalition spokesman U.S. Air Force Colonel John Dorrian said the additional U.S. forces would be working with local partners in Syria - the Syrian Democratic Forces (SDF) and the Syrian Arab Coalition - and would not have a front line role.
The additional deployment comprises a total of 400 U.S. forces - both Marines and Army Rangers. It adds to around 500 U.S. military personnel already in Syria, Dorrian said.
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| A Syrian Democratic Forces fighter stands near what he said was Islamic State fighters held prisioners by them, north of Raqqa city, Syria. REUTERS/Rodi Said |
The SDF, which includes the Kurdish YPG militia, is the main U.S. partner in the war against Islamic State insurgents in Syria. Since November it has been working with the U.S.-led coalition to encircle Raqqa, IS's main urban bastion in Syria.
This week, the SDF cut the road between Raqqa and the jihadists' stronghold of Deir al-Zor province - the last main road out of the city.
Islamic State is also being fought in Syria by the Russian-backed Syrian military, and by Syrian rebel groups fighting under the Free Syrian Army banner with Turkish backing in northern Syria and Jordanian backing in southern Syria.
Dorrian said the effort to isolate Raqqa was "going very very well" and could be completed in a few weeks. "Then the decision to move in can be made," he said.
The additional forces had arrived in "the last few days", he told Reuters by telephone.
The artillery will help "expedite the defeat of ISIS in Raqqa", he said, using another acronym for Islamic State. The Marines were armed with 155-millimetre artillery guns. Asked if they had been used yet, Dorrian said he did not believe so.
"We have had what I would describe as a pretty relentless air campaign to destroy enemy capabilities and to kill enemy fighters in that area already. That is something that we are going to continue and intensify with this new capability."
