Fourteen people were killed and 35 others were injured after a Ford F-150 truck plowed into pedestrians and gunfire erupted in the early hours of Wednesday morning.

During a press briefing on Thursday, the FBI’s deputy assistant director for the counterterrorism division, Christopher Raia, noted that while the investigation into the attack is in its early stages, investigators believe the suspect, 42-year-old Shamsud-Dim Jabbar, acted alone.

Jabbar, a Texas resident who FBI officials said proclaimed his support for the terror group ISIS in social media posts ahead of the attack, was killed in gunfire exchanged with New Orleans police.

Additionally, an ISIS flag was recovered by authorities from the back of Jabbar’s rented pickup truck following the rampage.

He was a U.S.-born citizen and Army veteran who previously worked for the consulting firm Deloitte, according to court records obtained by ABC News.

As a portrait begins to emerge about Jabbar and potential motivations behind the attack, federal investigators have laid out a timeline of events that led up to the incident officials have dubbed an “act of terrorism.”

Dec. 30: Truck rented in Houston

On Monday, Dec. 30, Jabbar rented a white Ford F-150 truck in Houston, Texas, through the car rental app Turo, according to officials.

Dec. 31: Jabbar drives from Houston to New Orleans

Federal investigators said that Jabbar drove from Houston to New Orleans on Tuesday.

The drive is approximately five and a half hours, spanning over 340 miles.

Jan. 1: Jabbar posts pro-ISIS videos to Facebook

During the press briefing on Thursday, Raia said that federal investigators found that Jabbar posted five videos to social media “proclaiming his support for ISIS.” The videos were posted between 1:29 a.m. CT and 3:02 a.m. CT, according to Raia.

“In the first video, Jabbar explains he originally planned to harm his family and friends but was concerned the news headlines would not focus on the ‘war between the believers and the disbelievers,’” Raia said.

In one of the videos, Jabbar noted that he joined ISIS before this summer, according to Raia.

Raia called the attack a premeditated “act of terrorism.”

Jan. 1: Attack on Bourbon Street

At approximately 3:15 a.m. CT, Jabbar plowed the rented truck into a blocked-off section of Bourbon Street where pedestrians were celebrating the holiday, according to officials.

The suspect mowed down dozens of people over a three-block stretch on the world-famous thoroughfare while firing into the crowd, police said.

The attack left 14 people killed and 35 others injured, according to officials, who said Jabbar was killed while exchanging gunfire with police during the rampage.

Jan. 1: Explosive devices recovered

Following the attack, authorities recovered two improvised explosive devices left in coolers in the Bourbon Street area, Raia said.

Surveillance footage showed Jabbar placing the devices in the coolers, according to Raia. Those were the only devices recovered and both were rendered safe, he said.

Jan. 1: Victims identifiedA young mother teaching her son to read. A former college football player “on top of the world” living in New York City. An 18-year-old aspiring nurse. A father of two remembered as the “life of the party.”

Jan. 2: Jabbar’s divorces and financial difficulties come to light

Jabbar had a checkered marital history punctuated by multiple divorces and financial difficulty, according to court records reviewed by ABC News.

The records also show that after his military service, Jabbar worked for Deloitte as he aimed to grow his own fledgling real estate business.

As of 2022, while employed by Deloitte, documents show Jabbar was making close to $125,000 a year — a salary that was chipped away at by court-ordered payments for his children from a past marriage, while being further eroded by credit card and mortgage debt.

Four years later, in 2016, Jabbar filed for divorce from another wife, Tiera Symone Jabbar, in Dekalb County, Georgia.

In July 2020, in Fort Bend County, Texas, Jabbar filed for divorce from his third wife, Shaneen Chantil Jabbar, whom he married in Nov. 2017, according to court filings.

Jan. 2: Bomb-making material recovered from suspect’s home

Bomb-making materials linked to the were recovered by FBI agents and local law enforcement Thursday at the suspect’s residence in Houston, Texas, sources confirmed to ABC News.

The items found were also referred to as “precursor chemicals” by agents in the field, sources said.

The items were found when agents executed a search warrant at the last known residence for Jabbar in the small community of Greenspoint, in north Houston.