Kassig's family says he was kidnapped on October 1, 2013 but they kept quiet at the request of the kidnappers because they were trying to secure his release.

Kassig's family also says he converted to Islam after his capture and now uses the name "Abdul-Rahman Kassig." There have been similar reports that John Foley and John Cantlie also converted to Islam.

Henning may have been killed on Sept. 20, when people in Raqqa reported seeing hostages going to the desert. It may just have decided to release the video today. From my ppost on Sept. 23:

There were reports from anti-ISIS activists in Raqqa this weekend that ISIS had taken a hostage to the desert. They saw the caravan of cars and trucks, just not who was inside or whether he was actually killed.

President Obama today:

Standing together with our UK friends and allies, we will work to bring the perpetrators of Alan's murder - as well as the murders of Jim Foley, Steven Sotloff and David Haines - to justice. Standing together with a broad coalition of allies and partners, we will continue taking decisive action to degrade and ultimately destroy ISIL."

Please don't post links to the video in comments.