Syrian army battles Isis in al-Mayadin town
The Syrian army and its allies have captured areas of Isis-held al-Mayadin in eastern Syria .
Backed by Russia and Iran, the Syrian army encircled the militants in al-Mayadin on Sunday.
In June, two U.S. intelligence officials told Reuters that they believed Isis had moved most of its diminished command structure and propaganda team to al-Mayadin, southeast of its former capital of Raqqa.
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