US-backed militias said on Monday they had pushed Daesh fighters out of the old quarters of Tabqa, a strategically vital town controlling Syria's largest dam, hemming the militants into the remaining modern district along the shore. The Syrian Democratic Forces (SDF), an alliance made up of Syrian Kurdish and Arab fighting groups, are fighting a multi-phased campaign to drive Daesh from its stronghold of Raqqa, 40km (25 miles) downstream and east of Tabqa. The SDF will wait to assault Raqqa until it seizes Tabqa, its military officials have previously said, but it had made slow progress since besieging the town in early April. This changed on Thursday when the SDF began to advance north into the old city. On Monday the SDF said in an online statement it had taken the last three neighborhoods of the old city and an adjoining industrial district. SDF forces were now fighting Daesh in the three modern quarters of the town which lie along the Tabqa reservoir, SDF spokesman Talal Silo said. Daesh still control the dam. The Syrian Observatory for Human Rights, a Britain-based war monitor, said on Monday the SDF now controls about 80 percent of Tabqa. In recent weeks the SDF has also squeezed Daesh's pocket of territory around Raqqa, which the militant group has used as a base to plot attacks and manage much of its self-declared caliphate since seizing the city in 2014. — Reuters