The attacker in the New Orleans vehicular attack used a rare explosive compound in two homemade bombs that failed to detonate, according to senior law enforcement officials. Investigators are examining how Shamsud-Din Jabbar learned about and produced a rare explosive never before used in U.

Lyonel Myrthil, special agent in charge of the New Orleans field office, second from left, shows footage of Shamsud-Din Jabbar, the man who carried out an attack on New Orleans' B