Twelve civilians were killed in attacks by regime forces in Syria's northwestern de-escalation zones, sources with the White Helmets civil defense agency said on Monday.
Four children were among the victims in the attacks that targeted the town of Kafr Nabl in Idlib province and Qastun in Hama last night, the sources said.
The new deaths brought to more than 415 civilians, who have lost their lives in Idlib since April 25.
The Idlib region controlled by former al-Qaida affiliate Hayat Tahrir al-Sham (HTS) is supposed to be protected from a government offensive by a September buffer zone deal, but the regime and Russian bombardment have increased there since late April.
Clashes between regime forces and terrorists raged Monday on the edge of the region following the deadly air raids overnight, the Syrian Observatory for Human Rights said.
The Observatory said Russian airstrikes overnight killed five children, four women, and one man in the town of Kafranbel in Idlib province.
The airstrikes hit near a hospital in the town, knocking it out of service, the Britain-based monitor said.
An AFP correspondent saw five homes on the edges on the town that were destroyed or damaged after the strikes.
Survivors picked through the debris to save the belongings they could, the reporter said, while a young man covered in dust from head to toe leaned against a wall, shell-shocked after his father was killed.
Umm Wasel narrowly missed the airstrike on her home after relatives invited her over to break her daily fast of the Islamic month of Ramadan with them.
"I came back at night to find my home devastated," said the 72-year-old, dressed in a long red robe and a black scarf covering her hair.
People "had thought I was under the rubble," she said.
The Observatory said six other civilians also died in bombardment by regime forces in other parts of the Idlib region on Sunday.
The opposition stronghold includes most of Idlib province as well as parts of neighboring Aleppo, Hama and Latakia provinces.
Fighting raged in the north of Hama province between loyalists and opposition forces from early Monday, the Observatory said, after a relative respite in bombardment over the past three days.
Russian airplanes pounded the south of Idlib province, while government aircraft targeted the north of Hama province with machine guns, missiles, and crude barrel bombs, the monitoring group added.
The deadly Russian airstrikes come after Russia on Sunday said Syrian armed forces had "unilaterally ceased fire in the Idlib de-escalation zone" from May 18 at midnight, but that fire of loyalists had continued.
Turkey and Russia inked a buffer zone deal to protect the Idlib region of some 3 million people in September, but regime fire has increased there since HTS took control in January.
Syria's war has killed more than 370,000 people and displaced millions inside Syria and abroad since starting in March 2011 with a crackdown on anti-government protests.
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