U.S.-backed fighters captured Syria's largest oil field from the Islamic State group Sunday, marking a major advance against the extremists in an area coveted by pro-government forces.
With IS in retreat, the Kurdish-led Syrian Democratic Forces and the Syrian government have been in a race to secure parts of the oil-rich Deir el-Zour province along the border with Iraq.
The Al-Omar oil field was a major source of income for the militant group and is considered one Syria's most productive. The condition of the field, which has been controlled by IS for three years, was not clear following intense coalition and Russian airstrikes.
The SDF, with air support from the...