Thirty of the jihadists were killed fighting against members of the Kurdish People's Protection Units (YPG) in the village of Qassiab in Hasakeh province, according to the Syrian Observatory for Human Rights.
The YPG regained control of the village, two days after it was seized by the jihadists, said the Britain-based group, which has a wide network of activists on the ground in Syria.
Three Kurdish fighters were also killed in the clashes, it added.
Another 14 jihadists and an YPG fighter were killed fighting in the flashpoint town Kobane in northern Syria, said the Observatory.
A US-led coalition has been launching air strikes against IS positions in Syria since September 23 and the YPG have also received backing from Iraqi Kurdish peshmerga and from some Syrian rebel groups.
The coalition had launched eight strikes against IS positions in Kobane yesterday, which is known as Ain al-Arab in Arabic.
Elsewhere, Syrian air force raids killed at least 21 people, including several children, in the IS-held areas of Al-Bab and Qbasin in the northern province of Aleppo, said the Observatory.
The regime air force has killed thousands of people, mostly civilians living in areas out of government control, since it was first deployed in the country's war in July 2012.
The UN and international rights groups have repeatedly called on the government to refrain from using its air force against inhabited areas.
Nearly four years of civil war ravaging the country have killed an estimated 200,000 people and also displaced half of the population.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
