An Army veteran who was "hell-bent" on killing as many people as possible drove a rented pickup truck around a parked police car serving as a barricade and plowed through a crowd of New Year's revelers on Bourbon Street in New Orleans, leaving at least 15 dead and injuring dozens of others early Wednesday, city and federal officials said.
After mowing down numerous people over a three-block stretch on the famed thoroughfare while firing shots into the crowd, the suspect -- identified by sources as Shamsud-Din Jabbar, 42 -- allegedly got out of the truck wielding an assault rifle and opened fire on police officers, law enforcement officials briefed on the incident told ABC News. Officers returned fire, killing Jabbar, a U.S.-born citizen from Texas, sources said. At least two police officers were injured, one by gunfire and the other when the officer was pinned by the truck, authorities said.
Althea Duncan, assistant special agent in charge of FBI New Orleans field office, said investigators do not believe Jabbar acted alone.
"We do not believe that Jabbar was solely responsible," Duncan said during a news conference Wednesday afternoon. "We are aggressively running down every lead, including those of his known associates. That's why we need the public's help. We are asking if anybody had any interaction with Shamsud-Din Jabbar in the last 72 hours that you contact us."
Addressing what he called "this heinous act" in a brief appearance before reporters Sunday night at the Camp David presidential retreat in Maryland, President Biden said that the FBI told him that "mere hours before the attack, [Jabbar] posted videos on social media indicating that he's inspired by ISIS, expressing a desire to kill."
Biden also said "law enforcement and the intelligence community" were investigating whether there was "any possible connection" between the New Orleans attack and the explosion of a Tesla Cybertruck Sunday outside of the Trump Las Vegas hotel.
"Thus far, there's nothing to report on that score," Biden said.
Biden also said that the suspect was "an American citizen, born in Texas. He served in the United States Army on active duty for many years. He also served in the Army Reserve, until a few years ago."
The FBI is studying the videos President Biden referenced in his remarks, which the suspect appears to have recorded while driving from Texas to Louisiana, law enforcement sources confirmed to ABC News.
The videos are dark so the suspect isn't seen but he can be heard talking about his divorce and a desire to kill members of his family before ultimately deciding to carry out the attack on Bourbon Street, according to the law enforcement sources.
The suspect is also heard talking about ISIS, the sources said.
A spokesperson for the consulting firm Deloitte confirmed to ABC News that Jabbar worked for the company in a "staff-level role" since 2021.
“We are shocked to learn of reports today that the individual identified as a suspect had any association with our firm," the statement said. "Like everyone, we are outraged by this shameful and senseless act of violence and are doing all we can to assist authorities in their investigation.”
A separate source at Deloitte confirmed to ABC News that Jabbar was still employed by the consulting firm as of Sunday morning and had the job title of “senior solution specialist.”
The FBI offices in New Orleans and Houston released statements late Wednesday announcing searches related to the New Orleans attack.
"FBI special agents and our law enforcement partners are currently conducting a number of court authorized search warrants in New Orleans and other states," the FBI's New Orleans field office said in a statement, adding that they planned to hand over the New Orleans crime scene to local authorities by Thursday morning.
Meanwhile the FBI in Houston posted on X that they and the Harris County Sheriff's Office were "continuing a court-authorized search of a location near the intersection of Hugh Road and Crescent Peak Drive."
"At this time, no arrests have been made, and FBI personnel will be at the scene for several more hours," the post continued.
New Orleans police have reviewed surveillance video that appears to show several people planting potential explosive devices in advance of the vehicle attack, which led them to believe he was not "solely responsible," sources said. Investigators are urgently working to identify the individuals who were seen on camera and take them into custody.
Duncan said Jabbar was an Army veteran. In addition to the assault rifle, Jabbar was allegedly armed with a handgun, sources told ABC News.
Authorities are also working to determine whether there may be a link between the New Orleans attack and a Tesla Cybertruck explosion on Wednesday outside the Trump Las Vegas hotel in Nevada, which is being investigated as a possible act of terror, an official said.
Multiple law enforcement sources told ABC News that the Cybertruck that exploded in Las Vegas was rented on Turo -- the same app sources said was used to rent the pickup truck used in the deadly attack in New Orleans.
Sheriff Kevin McMahill told reporters that investigators are trying to determine whether there is a connection to the New Orleans attack.
"We are heartbroken by the violence perpetrated in New Orleans and Las Vegas, and our prayers are with the victims and families," a Turo spokesperson said in a statement in response to an ABC News request for comment. "We are actively partnering with law enforcement authorities as they investigate both incidents."
"We do not believe that either renter involved in the Las Vegas and New Orleans attacks had a criminal background that would have identified them as a security threat," the statement continued. "We remain committed to maintaining the highest standards in risk management, thanks to our world-class trust and safety technologies and teams that include experienced former law enforcement professionals."
New Orleans Coroner Dr. Dwight McKenna released a statement late Wednesday afternoon that said "As of now, 15 people are deceased."
"It will take several days to perform all autopsies. Once we complete the autopsies and talk with the next of kin, we will release the identifications of the victims," McKenna's statement continued.
Rep. Troy Carter, D-Louisiana, told ABC News earlier Wednesday afternoon that the number of people killed in the incident had risen from 10 to 15. He said another 25 people were hospitalized with injuries.
On Wednesday afternoon, the FBI in Houston and the Harris County, Texas, Sheriff's Office, posted a message on social media that they are "currently conducting law enforcement activity near the intersection of Hugh Road and Crescent Peak Drive in north Houston."
"We have secured a perimeter in that area and are asking people to avoid the area," the notice said. "FBI Houston personnel and specialized teams will be on-site for several hours. This activity is related to this morning's New Orleans attack, but due to the ongoing nature of the investigation, no further information can be provided.