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US-led coalition hits Islamic State group in 4 provinces across northern and eastern Syria

  • Turkish Kurds watch clashes between Syrian Kurdish fighters and militants of the Islamic State close to Turkey-Syria border near Suruc, Turkey, Sunday, Sept. 28, 2014. (AP Photo)

    Turkish Kurds watch clashes between Syrian Kurdish fighters and militants of the Islamic State close to Turkey-Syria border near Suruc, Turkey, Sunday, Sept. 28, 2014. (AP Photo)  (The Associated Press)

  • Turkish Kurds watch clashes between Syrian Kurdish fighters and militants of the Islamic State close to Turkey-Syria border near Suruc, Turkey, Sunday, Sept. 28, 2014. (AP Photo)

    Turkish Kurds watch clashes between Syrian Kurdish fighters and militants of the Islamic State close to Turkey-Syria border near Suruc, Turkey, Sunday, Sept. 28, 2014. (AP Photo)  (The Associated Press)

Activists say the U.S.-led coalition has carried out several airstrikes targeting Islamic State group positions in northern and eastern Syria.

The Britain-based Syrian Observatory for Human Rights says the air raids overnight took place in four provinces: Aleppo, Raqqa, Hassakeh and Deir el-Zour. The entrance to Syria's largest gas plant, Conoco in Deir el-Zour, was among the targets.

The Observatory says there were casualties in the airstrikes, but that it has no concrete figures.

A resident on the Turkish side of the Syria-Turkey frontier says strikes Monday morning also struck the Islamic State-controlled town of Tel Abyad. The town is home to a border crossing.

The resident, Mehmet Ozer, says the strikes hit an abandoned military base and an empty school.