The Britain-based Syrian Observatory for Human Rights, an opposition war monitor, said rebels withdrew from Idlib province's Maarat al Numan town late on Tuesday.
The White Helmets, also known as Syria Civil Defence, said the attacks hit the town of Bidama and three villages –Maasaran, Tal Minnis and Kanayes – in Idlib province.
The regime attacked a Turkish military observation post in Idlib, officials said. The Russia-backed assault on northwestern Syria has killed over 800 people, with the UN warning three million people are at dire risk if the offensive continues.
The Syrian Observatory for Human Rights, a London-based war monitor, said that four children were among 15 civilians killed in air strikes by the Syrian regime and its ally Russia.
The clashes erupted between YPG militants and the Assad regime forces after the Syrian regime erected a checkpoint on a road connecting Al Hassakah province and Qamishli area.
Syrian regime media first reported that missiles were fired at the Shayrat air base near Homs and an air base in the capital Damascus. However state TV later said a false alarm had triggered air defence systems, and there was no attack.
UN findings backs claims by the US, France and Britain that a Syrian regime plane dropped a bomb with sarin on the town and falsifies Russia's claims that a bomb on the ground was the cause of the gas attack.
Failaq al-Rahman rebel group says attack caused suffocation to more than 30 people. Regime forces dismiss the attack as fabrication.
Families in the town of Khan Shaykhun try to carry on after the deadly chemical weapon attack on April 4 killed dozens and injured hundreds.
People of the Syrian town where a chemical attack killed nearly 90 people on April 4 are returning home, but they're worried about living in a place marked by death. France says the Assad regime ordered the strike.
In Idlib, survivors of a chemical attack describe scenes of "a tragic disaster."
Khan Shaykhun, reeling from a suspected chemical attack which killed more than 70 people on Tuesday, was again hit by at least five air strikes on Wednesday.
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