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Fighters from Islamic State group shell northern Syrian town amid heavy clashes with Kurds

  • People clear an area, previously controlled by Islamic State fighters, that was hit by an airstrike the day before, craters visible top left, west of Kobani, Syria, as seen from a hilltop on the outskirts of Suruc, near the Turkey-Syria border, Friday, Oct. 24, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)

    People clear an area, previously controlled by Islamic State fighters, that was hit by an airstrike the day before, craters visible top left, west of Kobani, Syria, as seen from a hilltop on the outskirts of Suruc, near the Turkey-Syria border, Friday, Oct. 24, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)  (The Associated Press)

  • Birds fly as smoke rises over the town of Kobani following airstrikes by the US led coalition seen from the outskirts of Suruc, near the Turkey-Syria border, Saturday, Oct. 25, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)

    Birds fly as smoke rises over the town of Kobani following airstrikes by the US led coalition seen from the outskirts of Suruc, near the Turkey-Syria border, Saturday, Oct. 25, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)  (The Associated Press)

  • People herd a flock of sheep backdropped by the Syrian city of Kobani engulfed in smoke, following airstrikes by the US led coalition on the outskirts of Suruc, near the Turkey-Syria border, Saturday, Oct. 25, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)

    People herd a flock of sheep backdropped by the Syrian city of Kobani engulfed in smoke, following airstrikes by the US led coalition on the outskirts of Suruc, near the Turkey-Syria border, Saturday, Oct. 25, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)  (The Associated Press)

Activists and a Kurdish official say fighters from the Islamic State group are shelling the northern Syrian town of Kobani, where they continue to fight Kurdish troops.

Idriss Nassan, a senior official in Kobani, said the Saturday fighting concentrated on the southern and eastern edges of the town, also known as Ayn Arab.

The Britain-based Syrian Observatory for Human Rights said the fighting concentrated on the eastern side of the town, surrounded on three sides by Islamic State fighters.

IS launched its offensive on Kobani in mid-September and captured dozens of villages before entering parts of the town.

Earlier this week, the U.S. Central Command said its forces conducted more than 135 airstrikes against the militants in and around Kobani, killing hundreds of IS fighters.