Nearly 100 combatants were killed on Friday in clashes between Syrian regime forces and rebels in northwestern Syria, a war monitor said.
Starting at dawn on Friday morning — and after bombing by the regime — fighting in northern Hama province killed 51 regime loyalists and allied militiamen, and 45 among the rebels, said the Syrian Observatory for Human Rights.
The clashes continued in the afternoon, the Observatory said.
Fighting has, meanwhile, taken place on the ground in parts of these anti-regime areas, particularly in northern Hama.
Syria's SANA news agency also reported bombardment on Friday.
"Units of the army today carried out massive bombing at dawn ... on positions of the terrorist Al Nusra Front in [and] around the villages of Jibine and Tal Maleh," SANA said, referring to positions held by former Al Qaeda-affiliate Hayat Tahrir al Sham.
TRT World's Sara Firth has the latest.
Buffer zone deal violation
Idlib and parts of neighbouring Hama, Aleppo, and Latakia provinces were supposed to be protected by a buffer zone under a September agreement between Russia and Turkey.
However, the region has come under increased bombardment by the regime and its Russian ally since HTS seized most of Idlib at the start of the year.
The Turkish defence ministry said on Friday that a Turkish soldier was killed and three others were wounded the day before by fire from Syrian regime forces against a Turkish observation post in Idlib province.
Ankara retaliated by targeting regime positions in the area.
Since late April, air strikes have killed 490 civilians, according to the Observatory, while fighting has killed 682 pro-regime forces and 821 rebels and militants.
The flare-up has also displaced 330,000 others, according to the United Nations, sparking fears of one of the worst humanitarian disasters in Syria's eight-year war.
The conflict in Syria has killed more than 370,000 people and displaced millions since it erupted in 2011 with the brutal repression of protests against the regime leader Bashar al Assad.