White House officials have reviewed the ISIS execution video released earlier today and say it confirms the death of captured American aid worker Peter Kassig, the Associated Press reports.
ISIS Claims to Have Beheaded Third American Hostage in New Video

ISIS militants released a grisly new video Sunday morning showing the mass execution of Syrian soldiers and the purported severed head of American aid worker Peter Kassig. Kassig—a former Army Ranger—was kidnapped while delivering medical supplies in northern Syria last year.