Passengers Being Escorted off Flight at Atlanta Airport Due to Bomb Threat; Japan Is Investigating a Video Purportedly Claiming Isis Executed One of Two Japanese Hostages; Obama Condemns Islamic States' Purported Killing of Japanese Hostage in New Video; Rocket Fire Slammed Into a Ukrainian City, Killing Dozens, as Rebels Launched an Offensive • SAT JAN 24, 2015 6:51 PM CT