Bomb-making materials were found at a short-term rental house, and the authorities said they had recovered a transmitter intended to set off explosives on the city’s famous Bourbon Street.

Fourteen people were killed and at least 35 injured in what authorities called a terrorist attack in New Orleans.

A U.S. Army veteran who drove a pickup truck into a crowd of New Year’s revelers in New Orleans, killing 15 people, had posted videos to social media hours before the carnage saying he was inspired by the Islamic State group and expressing a desire to kill,