President Joe Biden says the U.S. Army veteran who drove a pickup truck into a crowd of New Year’s revelers in New Orleans 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.

Shamsud-Din Jabbar, a Texas Army veteran, drove a truck with an Islamic State flag into a crowd of New Year’s revelers on New Orleans’s Bourbon Street, killing 15.