Brutal Tactics of Militant Group Have Startled Arab Nations BEIRUT—Outrage spread across the Arab world after the release of a video by Islamic State said to show the burning to death of a captive Jordanian pilot, raising alarm in the region over the militant group’s brutal tactics and startling Arab governments involved in the military campaign against it. The 22-minute video begins with footage of Jordanian involvement in a U.S.-led military coalition against Islamic State. It then shows what appears to be First Lt. Muath al-Kasasbeh describing Jordan’s military operations before he is burned alive inside a cage. Jordan’s government...