Daesh has warned that the Tabqa dam, which a U.S.-backed militia is trying to capture from the terrorist group, is at imminent risk of collapse because of airstrikes and increased water levels.
It also said in messages carried on its social media channels that the dam's operations had been put out of service and that all flood gates were closed.
The dam, on the Euphrates about 40 km (25 miles) upstream from Daesh's stronghold of Raqqa, is the largest in Syria. The U.S.-backed Syrian Democratic Forces has been battling to capture the dam from Daesh since Friday.
A Britain-based war monitor, the Syrian Observatory for Human Rights, said it had also learned from its own sources that the dam had stopped functioning but that Daesh remained in control of its main operational buildings and turbines.
The dam is about 4 km long and the SDF has advanced a small distance along the dam from the northern bank but its progress is slow because Daesh has heavily mined the area, the Observatory said.
