US airstrikes on Kobani killed hundreds of IS fighters: Pentagon

Smoke rises following an airstrike by the US-led coalition aircrafts in Kobani, Syria, during fighting between Syrian Kurds and the militants of Islamic State group, as seen from the outskirts of Suruc, on the Turkey-Syria border, Friday, Oct. 10, 2014. The buildings bottom, including a factory, bottom left, are within Turkey. 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. (Source: AP)

Smoke rises after an airstrike in Kobani, Syria as fighting intensified between Syrian Kurds and the militants of Islamic State group, as seen from Mursitpinar in the outskirts of Suruc, at the Turkey-Syria border, Wednesday, Oct. 8, 2014. (Source: AP photo)

Syrian Kurdish fighters take position as fighting between Islamic militants and Kurdish forces to the west of Kobani, Syria continues near the Turkey-Syria border near Suruc, Turkey, Tuesday, Sept. 30, 2014. (Source: AP photo)

Smoke rises after an airstrike in Kobani, Syria as fighting intensified between Syrian Kurds and the militants of Islamic State group, as seen from Mursitpinar in the outskirts of Suruc, at the Turkey-Syria border, Wednesday, Oct. 8, 2014. (Source: AP photo)