"IS launched a large-scale offensive at dawn... And managed to enter Ain Issa," said Redur Khalil, a spokesman for the Kurdish People's Protection Units.
"Clashes are continuing inside the town in the southern part to expel IS," he told AFP.
Ain Issa is some 55 kilometres north of IS's de facto Syrian capital of Raqa city, and fell to Kurdish and Arab forces on June 23, shortly after they took the border town of Tal Abyad from the jihadists.
The Britain-based monitor said IS had launched a counter- attack against fronts in both Raqa province and neighbouring Hasakeh.
Kurdish and rebel spokesmen also said IS was engaged in a large-scale attack in the two provinces, but denied that Ain Issa had fallen.
Kurdish fighters backed by Arab allies seized the frontier town of Tal Abyad from IS on June 16, after weeks of fighting during which they captured numerous villages in Raqa province from the jihadists.
After its capture, the anti-IS forces advanced to Ain Issa, taking both it and a former military base nearby.
But in recent weeks, IS forces have launched several counterattacks against the Kurds, including in Kobane, a small border town that the jihadists battled to capture for some four months.
Kurdish forces backed by US-led air strikes expelled the jihadists from Kobane in January, in a symbolic victory that grabbed international headlines.
They were able to fight off the counterattack there, but IS killed some 200 people inside the town before being pushed out.
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
