The toll of nine dead could rise as some people were seriously injured in the raids, the Syrian Observatory for Human Rights reported.
Britain-based Syrian Observatory for Human Rights says heavily-bombarded Maarat al Numan "is nearly besieged," with residents of several villages scurrying for safety in the northwest of the country.
Idlib today bears the brunt of the Assad regime's Soleimani-inspired scorched earth strategy which will blight Syria for a long time to come.
A war monitor says "fierce clashes" between loyalist forces, militants and allied rebels were taking place one kilometre west of Khan Shaykhun in Idlib province.
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.
As the Syrian regime battles the last rebel stronghold, could it begin to release those detained in inhumane conditions since the beginning of the conflict?
"We will never withdraw from the zone," says Hayat Tahrir al Sham, the largest militant group in northwestern Idlib, two days after regime announced a truce between it and opposition forces.
The war in Syria, now in its eighth year, has seen children paying the heaviest price. At least 33 have been killed since June this year, compared to 31 children during the entirety of 2018.
Opposition factions seized Hamameyat village and a hilltop in Hama province amid deadly clashes, war monitor SOHR says.
War monitor said that Syrian regime forces and insurgents fought fierce battles that left dozens dead in the country's northwest, as the regime tried to regain control of two villages they lost earlier this month.
Air strikes carried out by the Syrian regime and Russia targeted multiple towns in Idlib and Hama provinces.
Air strikes on the largely opposition and rebel-controlled region of northern Idlib followed air raids on Tuesday night and Wednesday that killed 23 civilians.
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