Senior law enforcement officials say the explosive devices left in New Orleans contained a rare compound not seen before in a U.S. terror attack. NBC News' Tom Winter ...
The subject of explosive compounds for engineering purposes, which has been discussed in several late numbers of our paper, has attracted considerable notice, and though the articles in question ...
Federal investigators examining the attack say that Jabbar used a very rare explosive compound in the two devices, two senior law enforcement officials briefed on the matter told NBC News.