World Bulletin / News Desk
ISIL detonated a bomb-laden vehicle at a Free Syrian Army (FSA) position in Susyan village.
Initial reports indicated at least 35 people died, with civilians and FSA members among the fatalities, the sources added.
On Thursday, the FSA, backed by the Turkish military, said it had taken control of "almost all" of the strategic town, according to Turkey’s defense minister.
“Almost all of Al-Bab is under control now, and a sweep operation is ongoing," Fikri Isik told reporters in the Aegean coastal city of Izmir.
"When the operation is over, we will be able to say that Al-Bab has been completely cleared of ISIL elements," he added.
Turkish-led Operation Euphrates Shield aims to provide security, support U.S.-led coalition forces and eliminate the extremist presence along Syria’s northern border with Turkey.
The operation, which began last summer, relies heavily on FSA fighters backed by Turkish artillery and air support.