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Obama: ISIS killing of Abdul-Rahman Kassig 'an act of pure evil'

The White House on Sunday called killing of U.S. aid worker Abdul-Rahman Kassig "an act of pure evil." President Barack Obama on Sunday offered his condolences to Kassig's family and strongly condemned the actions of the terrorist group ISIS.

The video features a masked militant with a British accent standing over a severed head. "This is Peter Edward Kassig, a U.S. citizen," the militant says, referring to him by the name Kassig used before he converted to Islam. Kassig, 26, of Indiana was working as a humanitarian aid worker in Syria when he was captured in October 2013.

"Abdul-Rahman was taken from us in an act of pure evil by a terrorist group that the world rightly associates with inhumanity," Obama said in a statement Sunday afternoon, adding that while ISIS "revels in the slaughter of innocents, including Muslims, and is bent only on sowing death and destruction, Abdul-Rahman was a humanitarian who worked to save the lives of Syrians injured and dispossessed by the Syrian conflict." British Prime Minister David Cameron said that the video illustrated the "depravity" of ISIS and that he was "horrified by the cold blooded murder of Abdul-Rahman Kassig."

The video also shows the beheadings of people who appear to be Syrian soldiers. The militant — who sounds similar to the man with a London accent featured in previous beheading videos — goes on to say Obama had lied about withdrawing troops from Iraq. Intelligence analysts SITE said the video was produced by ISIS' propaganda unit, the al-Furqan Media Foundation.

Kassig said in a letter to his parents in June that he was "pretty scared to die," urging them to "seek refuge and comfort" in the fact that he was providing humanitarian relief when he was captured.

Read more at NBC News