“The chairman of the House Homeland Security Committee said Sunday he thinks the Boston Marathon bombing suspects were trained in carrying out the attack.”
Duh - the older brother went to Russia for six months last year (and not for a Carnival Cruise on the Black Sea) and then returned to the US in July. It has been noted by his aunt that he was clearly devoted to radical Islam.
They may have had some kind of training, but I don’t think the “complexity” of the bombs is any evidence of that. A Freeper who claimed to be an electrical engineer posted on a thread in the days after the bombing and said he thought these were very simple devices — and were extremely dangerous even to the bombers themselves because the remote-control car activation method had very high risks for random detonation.