The 42-year-old Texas man showed no signs of radicalization. “It’s a complete surprise, a shock, to everyone,” his half-brother said in an interview.

Shamsud-Din Jabbar made no mention of plans for violence or affiliations with extremist groups in the recordings.

Law enforcement agencies are expanding their investigation into the New Year's ramming attack on New Orleans' Bourbon Street which killed 14 people and injured dozens more in the early hours of Wednesday.

The brother of Shamsud-Din Jabbar said his older brother became more conservative, but says he didn't see any signs of radicalization before the attack in New Orleans on New Year's Day.