Fighting between government and rebel forces has been reported in parts of Syria despite a nationwide truce coming into force overnight.
The Syrian Observatory for Human Rights, a UK-based monitoring group, said there had been fierce clashes and air strikes in northern Hama province.
It added that rebel-held Wadi Barada near Damascus was also bombarded. But the military denied doing so.
There has been no comment from Turkey and Russia, which brokered the truce.
The rival jihadist groups, Islamic State (IS) and Jabhat Fateh al-Sham, and the Kurdish YPG militia are excluded from the initiative, which is aimed at restarting peace talks in Kazakhstan’s capital Astana next month.
Reports of clashes emerged within hours of the truce starting at midnight local time (22:00 GMT on Thursday).
The Syrian Observatory said government warplanes had carried out 16 air strikes on rebel-held areas in the northern countryside of Hama province on Friday.
The Local Co-ordination Committees (LCC), an opposition activist network, said the town of Halfaya had been targeted.
The Syrian Observatory and LCC also reported fighting in Wadi Barada, a valley in the mountains northwest of Damascus.
They said helicopters had attacked the village of Basima and positions held by rebels and allied jihadists from Jabhat Fateh al-Sham, which was known as al-Nusra Front until it formally broke ties with al-Qaeda in July.
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