New ISIS Video Says It's "Executed" Peter Kassig, An American Aid Worker

Early Sunday morning, a new ISIS video claimed the group had executed Peter Kassig, an American aid worker and former veteran who was abducted in Syria last year. Authorities are working to verify the video, which is 16 minutes long and shows a militant with a British accent telling viewers: "This is Peter Edward Kassig, a U.S. citizen of your country. Peter who fought against the Muslims in Iraq while serving as a soldier."

If true, Kassig would be the fifth Western hostage to be killed by the group, and third American. Previously, ISIS executed journalists James Foley and Steven Sotloff, and had threatened to execute Kassig next.

Shortly after the video was made public, Kassig's parents released a statement.

In a profile in The New Yorker last month, journalist Joshua Hersh wrote of Kassig as a brave and dedicated humanitarian who returned to Syria in the face of danger. "This is what I was put here to do," he told CNN two years ago, according to the New Yorker. "“We get one shot at this, and we don’t get any do-overs."