The FBI says it recovered the black flag of the Islamic State group from the truck that an American man from Texas smashed into New Year’s partygoers in New Orleans’ French Quarter.

At its height, the group controlled a huge swath of Mideast territory and ruled over millions. Today, its brutal ideology still powers offshoots and inspires "lone wolves."

The radical Islamic State group, which once imposed a reign of terror over millions of people in Syria and Iraq, has been implicated in the New Orleans truck attack that killed 15 people and injured about 30 on New Year's Day.

At least 15 people are dead and dozens injured in New Orleans after a driver plowed a pickup truck into a crowd of New Year's revelers on Bourbon Street, police and city officials said. The FBI is investigating the incident as an act of terrorism.

The Federal Bureau of Investigation said the suspect in the New Orleans attack was inspired by Islamic State. The truck that plowed through a crowded street bore the militant

Shamsud-Din Jabbar recently renewed his Muslim faith after abandoning it in his 20s and 30s, his half-brother said.

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,