A U.S.-backed Syrian alliance of Kurdish and Arab militias on Sunday took a military airport in northern Syria held by Islamic State, close to the country's largest dam that may be in danger of collapse.
The Syrian Democratic Forces (SDF), an alliance of Kurdish and Arab militias supported by a U.S.-led international coalition, said in a statement it had seized the air base.
The SDF, backed by U.S. special forces in a campaign that has driven Islamic State from large swathes of northern Syria, fights separately from other rebel groups that seek to topple President Bashar al-Assad's rule.
Earlier, SDF spokesman Talal Silo said its fighters had seized "60 to 70 percent" of the airport but were still engaged in intense clashes with the ultra-hardline militants inside the air base and on its outskirts.
The SDF has been battling the militants near the Tabqa dam and air base west of the Syrian city of Raqqa in an accelerating campaign to capture Islamic State's stronghold.
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