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<blockquote data-quote="Dave70968" data-source="post: 3027936" data-attributes="member: 13624">They built it themselves.&nbsp; The shell was a pressure cooker, so Wal*Mart is a possibility.&nbsp; As to the explosive, I haven&#039;t been able to find specifics, but Wikipedia, citing the Boston Globe, says one of the bombers had purchased fireworks.&nbsp; Flash powder (as in firecrackers) is not necessarily the most powerful explosive out there, but it does have high brisance (bursting/shattering power).&nbsp; In truth, it could have been just about anything.&nbsp; Could easily have been ANFO--the quantities involved wouldn&#039;t have triggered any suspicion.&nbsp; Once you&#039;re working with a pressure vessel, you don&#039;t need exotic explosives to get good effect--the pressure vessel makes even things that would only burn in open air detonate violently (cf. smokeless powder, gasoline).&nbsp; Packed with nails, BBs, etc. (one report says authorities found the pull-tab from a zipper in one victim&#039;s wounds) and you have a serious mess.</blockquote>

[QUOTE="Dave70968, post: 3027936, member: 13624"] They built it themselves. The shell was a pressure cooker, so Wal*Mart is a possibility. As to the explosive, I haven't been able to find specifics, but Wikipedia, citing the [I]Boston Globe[/I], says one of the bombers had purchased fireworks. Flash powder (as in firecrackers) is not necessarily the most powerful explosive out there, but it does have high brisance (bursting/shattering power). In truth, it could have been just about anything. Could easily have been ANFO--the quantities involved wouldn't have triggered any suspicion. Once you're working with a pressure vessel, you don't need exotic explosives to get good effect--the pressure vessel makes even things that would only burn in open air detonate violently (cf. smokeless powder, gasoline). Packed with nails, BBs, etc. (one report says authorities found the pull-tab from a zipper in one victim's wounds) and you have a serious mess. [/QUOTE]

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