deir al zor syria u.s.-allied militias northern syria announce saturday formation civilian council govern oil rich eastern province deir al zor race syrian army capture territory hold islamic state syrian democratic force sdf include arab militias dominate powerful kurdish ypg militia launch operation deir zor province border iraq early month capture northern countryside advance east euphrates river saturday seize major gas field deir al-zor province islamic state militants rapid advance preempt syrian government also head direction separate offensive syrian army iranian back militias russian air power also month break years-long islamic state siege government-held part deir al-zor side euphrates river advance islamic state bring u.s.-backed force syrian government side back russia iran close proximity assault russian-backed syrian army u.s.-backed sdf time raise fear clash could stoke tensions compete world power sdf appoint one hundred tribal figure meet elect council run province sunday final communique council say priority return tens thousands displace residents province flee conflict restore basic utilities urge u.s. lead coalition provide aid war-torn province want cement tie among people province statement newly form deir al-zor civil council say extent kurdish control eastern province lie heart arab tribal area sensitive residents ankara fight three-decade kurdish insurgency inside turkey fear grow ypg ascendancy border northern syria many local arab tribes region also complain marginalize decision make blame ypg discrimination include force conscription youths ypg deny allegations establishment local council effectively run sdf expand sphere kurdish influence grow northern syria multi-sided conflict would mirror govern arrangements put place towns sdf repel islamic state u.s. ally syrian group form civilian council run deir al-zor