Plumes of smoke rise into the northern Syrian sky.
Footage obtained by Shaam News Network, which cannot be indepedently verified by Reuters, purports to capture planes bombing towns in Idlib.
On the ground, families said they were fleeing the destruction.
(SOUNDBITE) (Arabic) UNNAMED MAN, SAYING
"Missiles weighing 500kg held by balloons were dropped. This resulted in great destruction, great destruction in the town of Kafar Sijnah. We are witnessing mass genocide! children are being killed!"
In Cairo, UN envoy to Syria Lakhdar Brahimi met with Egyptian officials as part of a regional tour to build consensus on the conflict.
Brahimi earlier appealed to officials in Iran, one of President Bashar al-Assad's few remaining allies, to help arrange a ceasefire during the Islamic holiday Eid al-Adha.
Since March 2011, more than 30,000 people have died in the uprising the UN classifies as a civil war.
