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>> it says they're brilliant carrying out the attacks which al qaeda says were an absolute success. the magazine mentions copley square, fenway park, boston university. it says these heroic bombings exposed many hidden shortcomings of the american security and intelligence system. the tsarnaev brothers are believed to have read a 2010 inspire article entitled make a bomb in the kitchen of your mom, which detailed how to make the type of pressure cooker bombs used to carry out the attack in boston. and now boston may be leading al qaeda and yemen to offer new guidance to its followers. >> the m...

Boston feel today. >> well, piers, i think when i wrote that, i probably was a little more despondent than i should have been. i was sad yesterday, i wassing ay today. i got that sense from the city talking to people. we will never be the same, new york will never be the same after 9/11. but that doesn't mean whoever did this has won, has cowed us. because this is a very tough town. you know, we take only three things seriously here, and that's sports, politics, and revenge. and i think it's going to take a lot more than what was done yesterday to knock a town like boston out. and i really sen...

The actual evidence that would lead to the person or persons involved. >> this suggests a slightly higher level of them what was first thought yesterday and if so, does that narrow down the net of potential suspects? >> it does. the black powder, the acetone, peroxide, you don't want to let it get went. absolutely right. you want to protect the explosives, the detonator. when this bomb went off, talked to a couple of people and their first reaction was what is happening to people coming back from afghanistan? they are terrified that american soldiers with four or five to worse will come back a...

Open. hopefully, the evidence will take you where you need to go. i have run the boston marathon when i was the chief of new york. end went off at 4:09. have that bomb, often our before, with the stands and the surrounding sidewalks would have been completely packed. people getting access there could not have done that. however later on, the three and a half hours the crowds stand out and somebody going in with a backpack would not draw attention. i am not saying that out yet happened but it could happen that way as opposed to somebody planting the bomb early before the race because they check...

Resentful of being dismissed and all of this. it was a strange way to look at it. but i go back to the sophistication. i think when we finish with this, someone will say they knew what they were doing even if they were imitating a terrorist group. >> i was talking last night about this magazine, which is al qaeda sponsored magazine called inspire and in 2010-very detailed account, some graphics and on the screen now, of exactly how you could create and use a pressure cooker as a bomb and it says in the first edition called make a bomb in the kitchen of your mom, it says the pressurized cooker ...