this is "world news now." good morning to you. i'm reena ninan. >> i'm tahman bradley. why don't we get right to our top story, more about isis. >> the fallout from murder of american journalist steven sotloff. >> mourners gathered at a candlelight vigil at university of central florida which he attended. syrian-american students helped organize it. meanwhile investigators are analyzing the video that shows sotloff's execution, seeking clues about his killers, while a family member speaks out. >> we will not allow our enemies to hold us hostage with the sole weapons they possess -- fear. >> that sentiment echoed by world leaders including president obama and the british prime minister as well, as the u.s. considers a new raid to free western hostages held by isis in syria. isis terrorism in the middle east isn't the only major international hot spot right now. there is also ukraine.