While the evacuation, which was negotiated by Lebanon's Hezbollah group, removed the militants from the Syria-Lebanon border, it left both Iraq and the USA fuming.
The attacks could not be independently verified.
Russian Federation has launched seven cruise missiles at ISIS targets around the city of Deir Ezzor in Syria.
Russian submarines have fired seven cruise missiles at Isis militants in Syria, Russia's defence ministry reportedly said.
Russian Federation has provided military backing for Syrian President Bashar Assad's forces since 2015.
Syrian government forces broke a three-year Isis siege on parts of the provincial capital last week, and are now battling the extremists inside the city. The ministry said all the targets were destroyed. They had been advancing toward the city on several fronts in recent weeks, and reached the western outskirts of the city after Daesh defenses collapsed.
The convoy had been stuck in the desert following airstrikes by the U.S-led coalition to prevent its advance. On Thursday, a captive Hezbollah fighter was released.
The head of the Britain-based Syrian Observatory for Human Rights said buses and vehicles carrying about 400 militants and civilians crossed into Deir Ezzor province on Wednesday.
U.S. Army Colonel Ryan Dillon, a spokesman for the U.S. -led coalition fighting Islamic State, told reporters that the battlefield was already congested and the plan was for the SDF to move down the middle Euphrates River Valley.