Who was Shamsud-Din Jabbar, the suspect in New Orleans truck attack?

Shamsud-Din Jabbar, the 42-year-old Texas man accused of crashing a truck into New Year's Day revelers in New Orleans, killing 15 and injuring dozens of people, served in the U.S. Army for 13 years including a deployment to Afghanistan, the Army said.

Federal officials and local law enforcement in New Orleans said that Jabbar did not act alone and that they are looking for accomplices. The FBI said Jabbar had an Islamic State flag on his truck and view the attack as a potential act of terrorism. The Islamic State, or ISIS, is a Sunni Muslim militant group which has carried out attacks throughout the world.

While the investigation is ongoing, so far no information has surfaced to explain why Jabbar, a U.S. citizen raised in Texas, would carry out the New Orleans attack. Jabbar died at the scene in a shootout with police, officials said.