Syrian and Russian warplanes launched a series of airstrikes on Monday on areas taken over by rebels in north-west Syria during a surprise offensive, activists in Idlib and a war monitor said. According to the White Helmets,

At least 25 people were killed in airstrikes by Syrian and Russian forces in northwestern Syria on Sunday, as President Bashar al-Assad vowed to crush insurgents following their recent gains in Aleppo and Idlib. Among the dead were 10 children, with dozens more injured, according to the White Helmets, a Syrian opposition-run rescue group.

At least 25 people were killed in northwestern Syria in air strikes carried out by the Syrian government and Russia, the Syrian opposition-run rescue service known as the White Helmets said early on Monday.

NBC News’ Matt Bradley reports on the intensifying violence in the Syrian rebel offensive after Russian and Syrian jets struck a rebel held city in the northern part of the country. Syrian President Bashar Assad is vowed to crush insurgents waging a shock offensive against his regime.

Russian and Syrian fighter jets have struck the rebel-held city of Idlib on Dec. 1 amid attempts to push back an insurgency that has taken over most of Aleppo, Reuters reported, citing Syrian army sources.

Syrian and Russian air strikes killed at least 25 people across north-western Syria on Sunday, the White Helmets civil defence group said on Monday. The deaths were reported amid a second day of intense bombardment against a shock insurgency.

On Sunday, Russian and Syrian jets stepped up their bombing of northwestern Syria, targeting rebel-held areas, Reuters reports. According to Reuters, on December 1, aircraft from both nations struck the city of Idlib in northern Syria,