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Actually Steve Coll's blog might be able to shed some light on the level of training for these terrorists operating in the US ...

Last week, before the Times Square incident, I was talking with a former U.S. intelligence officer who worked extensively on jihadi cases during several overseas tours. He said that when a singleton of Shahzad’s profile—especially a U.S. citizen—turns up in a place like Peshawar, local jihadi groups are much more likely to assess him as a probable U.S. spy than as a genuine volunteer. At best, the jihadi groups might conclude that a particular U.S.-originated individual’s case is uncertain. They might then encourage the person to go home and carry out an attack—without giving him any training or access to higher-up specialists that might compromise their local operations. They would see such a U.S.-based volunteer as a “freebie,” the former officer said—if he returns home to attack, great, but if he merely goes off to report back to his C.I.A. case officer, no harm done. source

Even though the bomb didn't go off ... it should still worry the security folks as next time the terrorists might be luckier than the law enforcement guys ...