Beirut: At least 42 fighters were killed in 24 hours of fierce fighting between Islamist rebels and Daesh in Syria’s Damascus province, a monitoring group said Wednesday.

“At least 30 Islamist rebels and 12 fighters from Daesh were killed in fighting since Tuesday” in the hilly region of Qalamun, the Syrian Observatory for Human Rights said.

Qalamun is divided into a western portion, which borders Lebanon and is mostly controlled by the regime and its ally, the Lebanese Shiite movement Hezbollah.

The eastern sector has seen intense clashes between rebels and Daesh, and is strategic because it borders the “badiya,” the Syrian steppe.

These plains are used by rebels to transport weapons from the Turkish border to the north and the Jordanian frontier in the south.

According to the Britain-based Observatory, Daesh has already cut off one of these routes and aims to take more to “suffocate” the rebels.

Meanwhile, 13 civilians, including nine children, were killed Tuesday night in shelling in the northwest province of Idlib, whose provincial capital was overrun by Al Qaida’s Syrian affiliate and allied rebels.

Among them, a man and five children, three of them sisters, were killed in a regime air raid on Maarat Al Numan.

Seven others, including a couple and their four children, were killed by rebel shelling on Jisr Al Shughur, one of the last regime-held cities in Idlib province.

Since they lost control of Idlib city, regime forces have been trying to chip away at opposition-controlled parts of the province to protect their supply route between Ariha and Jisr Al Shughur.