The man who drove a pick-up truck into people celebrating the New Year in New Orleans is believed to have acted alone, the FBI has said.
There is also “no definitive link” between the attack and the Cybertruck explosion in Las Vegas, said FBI deputy assistant director Christopher Raia.
He called it “premeditated” and an “evil” act of terrorism, and that the attacker was “100% inspired by ISIS”.
Mr Raia said the agency was reviewing two laptops found at Jabbar’s home, three phones, and two improvised explosive devices (IEDs) recovered near the scene of the attack.
Officials started the news conference by paying tribute to the 14 “innocent victims” who were killed.
The truck rammed into people in the early hours of New Year’s Day on the city’s famous Bourbon Street.
Jabbar, a 42-year-old army veteran born in the US, was shot dead when he crashed and opened fire on police.
The FBI said he posted five videos on social media before the attack.
In one, he said he was planning to harm his family and friends, but was concerned headlines would not focus on the “war between the believers and disbelievers”.
Jabbar also said he joined Islamic State “before this summer” and provided a will, Mr Raia told reporters.
Several videos proclaiming his support for the terror group were were also posted on the evening of 31 December.
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