Most of those killed in the Idlib province town of Maarat Masrin were civilians, the Syrian Observatory for Human Rights said.
Their deaths came after those of three civilians, one of them a child, in strikes on the nearby town of Orum al-Joz late yesterday, Observatory head Rami Abdel Rahman said.
He said the strikes were carried out by Russian or Syrian government aircraft.
The US-led coalition too has carried out air strikes on targets in Idlib province in recent weeks.
Also Read
A ceasefire brokered by regime ally Russia and rebel ally Turkey that went into effect on December 30 has brought relative calm to most of the country.
But it excludes former Al-Qaeda affiliate Fateh al-Sham and its jihadist rival the Islamic State group.
Idlib province is largely controlled by a rebel alliance known as the Army of Conquest, which is dominated by Fateh al-Sham.
The ceasefire had been overshadowed by deadly fighting in the rebel-held Wadi Barada district, northwest of Damascus, which is the source of the capital's mains water supply.
The area was calm today for the first day since the nationwide ceasefire took effect late last year, the Observatory said.
"Maintenance workers began their work as soon as they entered (Wadi Barada) on Friday," a source in the provincial governor's office told AFP.
He said they were still assessing the damage and would then have to prepare the necessary equipment before being able to restore the supply. The United Nations says that 5.5 million people in Damascus and its suburbs have been without mains water because of the cut.
Disclaimer: No Business Standard Journalist was involved in creation of this content