The militants also clashed with the Kurds near the southeastern Turkish town of Ceylanpinar which borders the Syrian town of Ras al-Ain in the Hasaka province.
Ceylanpinar, whose residents are victims of stray bullets, has been on the receiving end of the fierce clashes.
Schools in the Turkish city remain closed and people have been asked to stay home.
On January 19, the Kurdish National Council — a coalition of Kurdish parties in Syria — condemned the ongoing assault “against unarmed civilians,” saying militants were shelling Ras al-Ain indiscriminately.
It demanded that the militants’ leadership “put pressure on these armed groups to stop this criminal war.”
The Kurds accuse the militants of collaborating with Turkey, engaged in a long-running battle against ethnic Kurds.
Syria has been experiencing unrest since March 2011, and many people, including large numbers of security forces, have been killed in the violence.
The Syrian government says the chaos is being orchestrated from outside the country, and there are reports that a very large number of the militants are foreign nationals.