Some of the rebel groups including Daesh and the Al-Qaeda-linked Jabhat Fateh al-Sham are not part of a natioanwide ceasefire which started at midnight on Thursday.
Fighting between regime forces and rebels has been reported in the western parts of Syria a day after a countrywide ceasefire backed by Russia and Turkey came into force.
Some of the rebel groups including Daesh and the Al-Qaeda-linked Jabhat Fateh al-Sham, are not part of the truce.
Meanwhile, the UN Security Council scheduled a vote on Saturday on a Russian resolution that would endorse the ceasefire agreement.
The draft resolution also calls for "rapid, safe and unhindered" access to deliver humanitarian aid throughout the country.
Russia is urging the council members to support the peace efforts.
TRT World's Ali Mustafa reports from Gaziantep near the Turkey-Syria border.