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Full extent perhaps of what she knows about what her sons were doing, if she had any idea they were up to any misdeeds at all. it's going to be absolutely key to try and precisely prove whether there was any genuine contact between tamerlan tsarnaev and this man. so many of their lives overlapped, the places they prayed, the skills tamerlan tsarnaev could have been shown. we don't ever know if those two pieces actually ever connected. perhaps the russian security services do, anderson. >> as you said, bob, you were skeptical of this whole idea they built these devices on their own or didn't ha...

You for joining us. this is a pipe bomb. we knew from our sources that five pipe bombs were thrown at police in that dramatic shoot-out in watertown in the middle of the night, but now we know that an elbow pipe was used and it was a similar design to an al qaeda online magazine, is that right? >> that is right. it's a new development. investigators look to narrow down the motive behind the boston marathon attack and some of the answers may lie in the online publication. it's essentially the organizations attempt at looking to influence english-speaking radicals. what is scary is how easy it's...

Pieces actually ever connected. perhaps the russian security services do, anderson. >> as you said, bob, you were skeptical of this whole idea they built these devices on their own or didn't have some sort of guidance in a way. susan candiotti reporting based on one single source in law enforcement that one of the bombs, the suspects allegedly used against police during the gun fight last week in watertown, involved an elbow pipe which is similar to what's in an al qaeda magazine and is sort of known as being a device from that al qaeda magazine. i guess it's not kind of the regular way to mak...

>> as you said, bob, you were skeptical of this whole idea they built these devices on their own or didn't have some sort of guidance in a way. susan candiotti reporting based on one single source in law enforcement that one of the bombs, the suspects allegedly used against police during the gun fight last week in watertown, involved an elbow pipe which is similar to what's in an al qaeda magazine and is sort of known as being a device from that al qaeda magazine. i guess it's not kind of the regular way to make this kind of a pipe bomb. does that shake your faith that there were others involv...

I'm erin burn out out front tonight. new developments in the boston terror investigation. a u.s. official tells cnn that one of the explosive devices found at last week's gunfight between police and the boston bombing suspects is similar to a design outlined in a magazine. this magazine to be specific. it's called "inspire." it's the al qaeda magazine. it's on line. this is the summer edition from 2010 which details how to make a metal elbow pipe wrapped in black tape, similar to what was found on the suspects. now i have a copy of this magazine. it's 67 pages long. and the section here that w...