either simply wrong or confused. The NPR story you cite as authoritative is a case in point. Frankly I don't understand how reporting can be so contradictory especially days after the event. The device was meant to explode but failed. PETN is a powerful explosive that is highly explosive and in the same chemical family as nitroglycerin.
How can US news sources get this so wrong? The device was meant to explode but failed because it wasn't mixed well enough. Read what the The Independent (UK). BTW The Independent ran this the same day as the NPR report.
snip
The high explosive used was identified by the FBI as Pentaerythritol, better known as PETN – a major component of Semtex. He injected a detonating liquid into the PETN with a syringe, but the bomb failed to explode.
snip
Chaim Koppel, a security consultant, added: "I think the explosive was supposed to go bang rather than just start a fire. The terrorists probably didn't mix it well enough. Maybe they didn't do enough practice runs, but the more the guy is trained, the more exposed he is to MI5, MI6, the FBI and other security agencies, so he probably didn't receive enough training."
snip
The devices may not be competent," Dr Leivesley said. "Scientists will now try to replicate the method in the laboratory and then we'll know. The reason it didn't go off may be a fault with the device, or human error. The reports so far suggest that the bomber sat quietly after the incident, but had suffered third-degree burns on his leg. That suggests to me that he may have been sedated in order not to appear anxious, but that may have impaired his ability."
And NPR states he hasnt been linked to terrorists. Wrong. Even his father linked him to terrorists.
snip
Dr Mutallab said he was planning to meet with police in Nigeria last night after realising his son had joined the notorious roster of al-Qa'ida terrorists, and is said to have warned the US authorities about his son's extreme views six months ago.
http://www.independent.co.uk/news/world/americas/wealthy-quiet-unassuming-the-christmas-day-bomb-suspect-1851090.htmlUnfortunately by all appearances King wasn't jumping the gun.