Hours after posting a footage of the mass execution of almost 300 Syrian soldiers in the desert, the Islamic State of Iraq and Syria (ISIS) uploaded another video delivering its second threat to the U.S.

The Islamist militant group held captive 15 Kurdish soldiers and threatened to kill them if the U.S. will not pull out from the war. The video, which was uploaded with the hashtag "2ndAmessagetoAmerica," showed the beheading of one of the Kurdish soldier, according to the Daily Mail.

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ISIS members threatened to decapitate the remaining Kurdish soldiers if the United States continues to support the Kurds. The beheaded soldier was killed on a roadside in Iraq as the Great Mosque of Mosul was seen in the background of the graphic video.

The latest video was uploaded ten days after the terrorist group reportedly sent their first message to the U.S. when they decapitated American journalist James Foley.

Kurdish military forces started fighting with the ISIS back in June and they have been helped by Western powers such as the U.S. and the U.K. These countries have been supplying the Kurds some weapons as support.

The six-minute video showed the Kurdish soldiers wearing orange boiler suits. Their clothes were very much alike to those worn by prisoners at Guantanamo Bay. The soldiers confirmed that they were captured by the ISIS members and that they were fighting for Peshmerga.

The video also included the soldiers still wearing the Peshmerga uniforms. One of the soldiers, identified as Hasaan Mohammed Hashing, read a statement suspected to be written by the ISIS.

Hashing's statement was directed to Kurdish leader, telling them they committed a "huge mistake" by cooperating with the U.S.

One of the masked fighters then spoke in Arabic, delivering a hateful message to the Americans to U.S. President Barack Obama. He asked how Obama could send his nation and his soldiers to Iraq even if thousands have already sacrificed thier lives in wars.

The rebel also asked Obama if the he already forgot the images of the corpses of his people. He talked about the crisis of the US, noting that they are getting themselves into a new one by being an ally to one of the countries fighting the ISIS.

The video ended with ISIS fighters shown parading near the mosque, waving their flags and weapons in the air.

TagsISIS, Syrian Soldiers, Video, Uploaded, YouTube, Executed, 250, soldiers