Investigators said they recovered an ISIS flag from the pickup truck, and FBI bomb technicians also found two improvised explosive devices (IEDs) in coolers: one that was found at the intersection of Bourbon and Orleans streets and one at another intersection about two blocks away.

At least 14 people were killed during a deadly attack on New Year's Day when a driver slammed into a crowd celebrating New Year's on Bourbon Street in New Orleans, in what is being investigated as a suspected terrorist attack.

"The FBI is leading the investigation to determine what happened," Biden said in a filmed address to the nation.

On Wednesday, a cybertruck outside Trump Tower in Las Vegas exploded after fireworks inside detonated leaving one person dead and other injured.

They say Livelsberger, an active-duty US special forces soldier, rented the vehicle and drove it from Las Vegas from Colorado. The case and motive of the explosion is still under investigation, but parallels have been drawn between the subject in the Cybertruck explosion and the suspect involved in the New Orleans attack on New Year's Day.

Authorities speak in a news conference on Jan. 2, after a Tesla Cybertruck exploded at Trump International Hotel in Las Vegas on New Year's Day.