The Sunni extremists, who follow a radical interpretation of Islam, have repeatedly targeted religious and ethnic minorities in Syria and Iraq since seizing control of large swaths of both countries. The group's fighters have ransacked churches, demolished Shiite and Sunni Muslim shrines, and enslaved women of the Yazidi community, a tiny sect IS considers heretical.
The latest assault began before dawn yesterday, when the militants swept through the villages nestled along the banks of Khabur River near the town of Tal Tamr in Hassakeh province. The area is predominantly inhabited by Assyrians, an indigenous Christian people who trace their roots back to the ancient Mesopotamians.
Kino said his organisation based its information on conversations with villagers who fled the attack and their relatives.
The Britain-based Syrian Observatory for Human Rights also reported the abductions, but put the number of Christians held by the Islamic State group at 90. The Observatory relies on a network of activists inside Syria.
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"Land lines have been cut, their mobiles are closed," she told The Associated Press. "Have they been slaughtered? Are they still alive? We're searching for any news."
She spoke on condition of anonymity for fear of endangering relatives believed to be held by the militants.