The IS has been threatening civilians in al-Bab and trying to push them to stay in the city where the roads and streets have been blocked by the terror group, Xinhua news agency reported.
Meanwhile, a Turkish soldier who was injured in al-Bab during a clash with the IS, died on Monday.
At least 16 Turkish soldiers were killed in an IS attack on December 21 in al-Bab as Turkish troops and Ankara-backed Syrian rebels battle to take the town from jihadists, Turkish Defence Minister Fikri Isik said.
According to Isik, three Turkish soldiers were also abducted by the IS in northern Syria.
The Turkish Army on August 24 launched the Euphrates Shield Operation against the IS and the Syrian Kurdish People's Protection Units, the military wing of the Syrian Kurdish Democratic Union Party.
Turkish President Recap Tayyip Erdogan said the operation was meant to end the rule of Syrian President Bashar al-Assad.
Turkey lists the YPG and the PYD as terrorist organisations due to their links to the PKK.