From FARS August 15 Syrian War sitrep under "Deir Ezzor" heading:
Thousands of ISIL terrorists have been transferred from areas under their control in Deir Ezzur to Hasaka and Raqqa provinces and thousands of others have been taken to [U.S.] al-Tanf military base and received training there in line with Washington’s plan to revive the ISIL in Eastern Syria.
The Arabic-language website of the Russian Sputnik news agency quoted Kurdish sources in Hasaka province as saying that Washington is trying to once again revive the ISIL terrorists in Eastern Euphrates.
The Kurdish sources reiterated that the US has transferred thousands of ISIL terrorists from Baghouz region in Eastern Deir Ezzur to other parts of the province as well as Raqqa and Hasaka provinces.
“Meantime, the Ovais Qarani Brigade terrorists who are the most important ally of the ISIL terrorist group and the security branch of the Syrian Democratic Forces (SDF) have been stationed in Raqqa,” they added.
The sources said that the US Army has transferred thousands of other ISIL terrorists from different regions, including Deir Ezzur, Hasaka, Damascus outskirts, Houz al-Yarmouk in Dara’a and Taloul al-Safa in Sweida’s Badiyeh (desert), to al-Tanf military base in Eastern Syria and has been training them.
"Whenever asked, the US army introduces these ISIL militants under its training under different names and labels such as Maghavir al-Thura, Asvad al-Sharqieh or the new Syrian army," they concluded.