The FBI confirmed that it has identified the driver who killed 10 people and injured dozens in New Orleans as 42-year-old Shamsud-Din Bahar Jabbar.

Investigators are working to gather additional information about Jabbar’s background and investigating an Islamic State flag that was with the vehicle, the FBI said.

The FBI said Jabbar is a U.S. citizen from Texas and the agency said it is working to determine Jabbar’s potential associations and affiliations with terrorist organizations. Authorities are also looking into whether other people may have been involved.

Jabbar was killed by police after he exited the vehicle and opened fire on officers, police said. Two officers were shot and are in stable condition, police said. They were in addition to 33 people injured in the vehicle attack.

A photo circulated among law enforcement officials showed a bearded Jabbar wearing camouflage next to the truck after he was killed. The attack happened around 3:15 a.m. in an area teeming with New Year’s revelers.

Investigators recovered a handgun and an AR-style rifle after the shootout, a law enforcement official said. The official was not authorized to discuss details of the investigation publicly and spoke on condition of anonymity.

The FBI said a potential improvised explosive device was located in the vehicle and other potential explosive devices were also located in the French Quarter.

New Orleans Mayor LaToya Cantrell described the killings as a “terrorist attack.”