The FBI now says the New Orleans truck attacker acted alone in an "act of terrorism" when he drove a pickup truck into a crowd of New Year's revelers early Wednesday, killing 15 people. The driver had posted videos on social media hours before the carnage saying he was inspired by the Islamic State group and expressing a desire to kill, President Joe Biden said. The FBI identified the driver as 42-year-old Shamsud-Din Bahar Jabbar.