Syrian activists say the Islamic State group has launched a major offensive along the Turkish border, seizing two villages near a border town captured by Western-backed rebels two days ago.
The Britain-based Syrian Observatory for Human Rights, which relies on activists inside the country, says IS militants seized Sheikh Reeh and al-Bal on Sunday.
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The activist-run Azaz Media Center, based in a northern town of the same name, says the extremists exploded seven bombs around Marea and other villages and towns, calling it the fiercest IS offensive in a year.
The IS-linked Aamaq News Agency claims the capture of the two villages and says a suicide operation targeted rebel fighters in opposition-held Kafr Shousha.
The Western-backed Free Syrian Army captured the border town of al-Rai from IS on Friday.