Friday Briefing: F.B.I. Said the New Orleans Attacker Acted Alone

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Investigators said yesterday that the U.S. Army veteran who plowed a pickup truck into a crowd of New Year’s revelers in New Orleans acted alone. They had said earlier in their investigation that they were looking into whether other people might have helped him plant explosives in coolers in the city’s French Quarter.

“We’re confident, at this point, that there are no accomplices,” Christopher Raia of the F.B.I.’s counterterrorism division said at a news conference. The authorities conducted hundreds of interviews and reviews of the attacker’s calls, social media accounts and electronic devices.

At least 14 people were killed in the attack on Wednesday and dozens were wounded. Here’s what we know about them.

The attacker: Shamsud-Din Bahar Jabbar, who died in a gunfight with police, served eight years in the U.S. military and was deployed to Afghanistan. Jabbar, who grew up in Texas, said in a video posted online that he had joined the Islamic State group. “He was 100 percent inspired by ISIS,” Raia said. Here’s what we know about him.

Tight security: Bourbon Street reopened and there was an increased police presence around the venue of the Sugar Bowl, a college football game that was expected to draw a huge crowd. The event had been postponed from Wednesday because of the attack.

A link to another attack? The F.B.I. has found no definitive link between the New Orleans attack and the explosion of a Tesla truck outside a Trump hotel in Las Vegas, but investigators are not ruling anything out. The driver shot himself in the head just before the truck exploded.

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