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Obviously the investigators are still trying to figure out what was behind this, who the bomber is. Im told theyve identified a male as the bomber but theyre still trying to learn more about him. What is most striking to you . What was the bomb made out of . Because that leads you to oo lot of conclusions. This is the deadliest Terror Attack since july 7th, 2000 fiv 2005. And almost certainly a Hydrogen Puraukside bomb. Because the signature of al qaeda and isis are these kinds of bombs. So where was it made . Because you need a commercial refrigerator often the store the chemicals. Theyre ver...

Peroxide bomb. >> would it be a loan wolf scenario? or how likely would that be? >> i'm skeptical. we've had people in this country build those bombs and kill themselves. it's difficult. you need training. i've been in bomb making courses where it takes many hours. the proportions are very, very careful. this is not something you can just read on the internet and make, usually, by yourself. >> i've spoken to british counterterror officials repeatedly over the last several months and they talk about a constant level of threat and a number of plots toward it in recent months. they're already on ...

Didn't get overseas training. they are looking at the traveling of the older brother to dagestan. this commander abu dujana was running bomb making courses for people in the countryside. they'll be looking another that very, very closely. no evidence he met this commander abu dujana. >> it is interesting that there is a mosque in dagestan in that city that is considered radical by the locals there. so again, we're trying to look into that again. a police sergeant quick thinking helps him and police officers that the shootout that occurred late thursday night and friday morning. ♪