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This one was triggered by a timer. this bomb was clearly larger and more powerful than the first. >> there were a lot of differences there which leaves you with two alternatives. either he's experimenting, graduating up to bigger and better things. the other alternative is that it was two separate people that made these devices. >> to find out, forensic examiners looked at the wire from the second bomb site. was this the same signature wire used in the first bomb? >> it was a silver-coated, single-strand copper wire with blue insulation. >> it's 30-gauge. it's a very small wire. >> but was it ...

This one was triggered by a timer. this bomb was clearly larger and more powerful than the first. >> there were a lot of differences there which leaves you with two alternatives. either he's experimenting, graduating up to bigger and better things. the other alternative is that it was two separate people that made these devices. >> to find out, forensic examiners looked at the wire from the second bomb site. was this the same signature wire used in the first bomb? >> it was a silver-coated, single-strand copper wire with blue insulation. >> it's 30-gauge. it's a very small wire. >> but was it ...