What is Islamic State, the radical group implicated in New Orleans deadly mass killing? Explained

New Orleans crash: The suspect in the New Orleans deadly was mass killing was identified as 42-year-old army veteran Shamsud-Din Jabbar. Authorities found an Islamic State flag in the truck which he rammed the crowd, killing 15 people. The suspect, who was killed in a shootout with the police, had reportedly pledged allegiance to the ISIS in his Facebook videos a night before the deadly attack.