A suspect who was "hell-bent" on killing as many people as possible drove a rented pickup truck around barricades and plowed his vehicle through a crowd of New Year's revelers on Bourbon Street in New Orleans at a high rate of speed, leaving at least 15 dead and injuring dozens of others early Wednesday, city and federal officials said.After mowing down numerous people over a three-block stretch on the famed thoroughfare while firing shots into the crowd, the suspect -- identified by sources as Shamsud-Din Jabbar, 42 -- allegedly got out of the truck wielding an assault rifle and opened...