DAMASCUS, Jan. 6 (Xinhua) -- The Kurdish-led Syrian Democratic Forces (SDF) advanced on Sunday and besieged the Islamic State (IS) in the last two towns in the eastern Euphrates River region in eastern Syria, a war monitor reported.
The IS militants are now besieged in the towns of Souseh and Baghous as the SDF fighters have managed to capture large areas in the last IS-held pocket in the eastern Euphrates region in Syria's eastern province of Deir al-Zour.
The Syrian Observatory for Human Rights said that a sandstorm hit the area, sparking fears that the IS militants could take advantage of the bad weather to launch counter-attacks.
The SDF fighters, with the help of the U.S.-led coalition, have been on a crushing offensive against the last IS-held pocket since last September in the hope of dislodging the terror-designated group near the Iraqi border.
Meanwhile, the Observatory said that 300 people, mostly women and children, fled the IS-held areas in the eastern Euphrates toward the areas controlled by the SDF.
The Britain-based watchdog group said that around 13,250 people, including 550 IS militants, have fled the areas in the eastern Euphrates since Dec. 19, 2018 when the U.S. President Donald Trump announced the decision to withdraw U.S. forces from Syria.