They added that the ISIS has seized 20 boats that were used to transfer the civilians on the Northern and Southern coasts of Euphrates river.
Also, the ISIS has stopped operations to transfer tens of civilian families from Raqqa to the SDF-controlled areas.
The sources said that the ISIS forces are now on alert in Raqqa.
Other reports from Deir Ezzur and Raqqa also said that the ISIS has in recent days recited al-Baghdadi's demand for help at the two cities' mosques, calling on Muslims in the ISIS-controlled areas to mobilize against the SDF attacks in Raqqa.
Latest reports from Raqqa said that the SDF continued their advances against ISIS and pushed them back from Watani hospital in the Western part of al-Tabaqa city in Northeastern Syria.
Firat news agency reported on Monday that the Kurdish fighters engaged in tough battle with ISIS and managed to capture Watani hospital in al-Tabaqa city, killing four terrorists, including one of their leaders, Abu Mohammad Al-Qahtani.
In the meantime, the Kurdish Hawar news reported that the SDF stormed ISIS's positons in different parts of al-Tabaqa city, killing up to 19 militants.
The agency specified that four snipers were among the ISIS militants killed in the clashes in al-Tabaqa neighborhoods of Hey Ewwel and Hey Salis.
The news agency noted that two SDF fighters were injured during the clashes.
Well-informed sources reported on Saturday that a sum of 76 ISIS terrorists were killed in clashes with the SDF in a village in Western Raqqa.
The sources said that the SDF continued their operation codenamed the Euphrates Rage to hit ISIS's positions in Raqqa province and managed to capture the village of Sahel al-Khashab after four-day-long clashes with ISIS East of Sweida al-Kabireh settlement.
The ISIS lost 76 members in the SDF attack, they added.
In the meantime, heavy fighting is underway between the SDF and the ISIS in the trinary neighborhoods of 1, 2 and 3 in al-Tabaqa city.