ISIS, known for its videos of hostage decapitations, apparently decided to up the ante Tuesday, reportedly releasing photos appearing to show captured Jordanian pilot Muath al-Kasaesbeh being burned alive. The U.S. government has not verified the images yet. al-Kasaesbeh was captured in late December after his plane went down in Syria; ISIS claimed to have shot the plane down, though intelligence sources disputed this. ISIS has been bargaining with three different hostages to secure the release of Iranian Sajida al-Rishawi, imprisoned by Jordan for a 2005 attack that killed 60 people. It had said it would spare al-Kasaesbeh if al-Rishawi...