A US army veteran with an Islamic State flag and "hellbent" on carnage steered a pickup truck into a crowd of New Year revelers in New Orleans on Wednesday, killing at least 15 people and wounding dozens, officials said. The FBI identified the attacker as Shamsud-Din Jabbar, a 42-year-old US citizen from Texas. He appeared to have been a real estate agent working in Houston and had served as an IT specialist in the military. Officials said they were searching for accomplices but gave few details. Police Superintendent Anne Kirkpatrick described Jabbar as a "terrorist," while the FBI said "an ISIS flag was located in the vehicle," using another name for the Islamic State jihadist group, and saying it was probing his links with such organizations. US President Joe Biden, describing the attack as "despicable," said Jabbar had posted videos online hours before "indicating that he was inspired by ISIS." Officials said a manhunt was underway, with FBI agent Alethea Duncan warning that authorities "do not believe that Jabbar was solely responsible." Louisiana Governor Jeff Landry said: "We're hunting some bad people down." An FBI spokesman told AFP that 15 people had been killed, citing the New Orleans coroner's office.