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For each person. mine was to hide in this boat and shed some light on our actions. we're also learning that the tsarnaevs used christmas lights and model car parts to make the explosives. david mattingly has this "outfront" investigation on just how dangerous these devices can be. >> reporter: at this remote desert testing ground, experts from new mexico tech replicate and explode bombs used by terrorists. on this day, there is a sense of urgency. >> after boston, what are you worried about? could this be the future of domestic terrorism? >> well, you're always worried about copycats. are more...

>> could they believe it? we can only imagine what it is like when you find out something like this. some people in the family have been in disbelief they don't think those men could have done this. what did the sisters think? >> continuous crying. i basically said i'm here as the mayor. my concern is your safety. my concern is your health. let us know whatever you need. i'm here to, you know, the same thing with every resident of west new york. >> the mayor also says his relatives are afraid to leave the house. there was a police car stationed outside of the house and they are worried for the...

A pressure cooker bomb like the devastating devices here in boston certainly can be built for under $100. cnn commissioned experts have a testing facility in new mexico to build and detonate one. the idea is to learn how these devices work, and possibly how to prevent them from doing so much harm. here's cnn's david mattingly. >> reporter: at this remote desert testing ground, experts from new mexico tech replicate and explode bombs used by terrorists. on this day, there's a sense of urgency. >> after boston, what are you worried about? could this be the future of domestic terrorism? >> you're...

Questions for the surviving tsarnaev. are there any more bombs out there, and did the brothers have any help in setting up their murderous attacks? according to sources, investigators are questioning him regularly. they're interviewing him in his hospital room while he is under the care of his doctors. one of the most frightening things about the attack in boston is just how simple the bombs were to make. to learn how to protect against this type of explosive you have to know what they can do. cnn commission and explosives expert to build a pressure cooker bomb, and david mattingly reports o...

Welcome back. building of pressure cooker bomb like ones used in boston is easy and cheap. literally all it takes internet access and less than 100 bucks. this is just a matter of fact. the bigger fact is the explosion they can cause are very serious, just like the one you just saw. learning how isn't the point of the next story. that's something you have to understand. cnn commissioned bomb experts at a testing facility in new mexico to bill and detonate a pressure cook, bomb. the point, to learn more about what these bombs do. perhaps how to prevent them from doing so much harm. here is cnn'...