Shamsud-Din Jabbar, 42, drove a rented truck into a crowd in New Orleans, killing at least 14 people before being shot by police.
He reportedly had an AR-15-style weapon and planted improvised explosive devices, later defused by law enforcement.
His brother, Abdur-Rahim Jabbar, expressed shock, noting a recent bond over caring for their father, despite recognizing changes in Shamsud-Din's behavior.
FBI investigates the incident as an act of terrorism, following Jabbar's social media posts supporting ISIS before the attack.
This incident has left families in mourning, with Abdur-Rahim Jabbar acknowledging the profound impact on victim's families amidst his own grief.
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