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That before in my career except on something similar on tv. >> reporter: one thing about that strange letter was all too obvious. whoever wrote it had inside knowledge because nobody besides the cops knew what the atf had discovered. >> we hadn't told anybody it was a bomb, so for somebody to just write a letter claiming responsibility for a bombing that lended some credence to the fact that the author of that letter was the real thing. >> weird. all too weird. detective salm and the others went home for the weekend to digest what they had just read and seen. and then, monday morning, salm's p...

Went home for the weekend to digest what they had read and seen. then monday morning his phone rang, 7:00 a.m. >> he says hey, get in here. we got another one of those letters. i came to work. there was a second letter sitting on my desk. this one was slightly smaller manila envelope or half size. but configured the same way. label maker, address, ayala case, and way too much postage again. >> reporter: huh. what was inside that one? >> it was a diagram of a bomb. >> coming up, invitation from a killer. >> the letter said if you have any questions, place an ad in the sacramento bee. make sure ...

Labelmaker, address, ayala case, and way too much postage again. >> reporter: huh. what was inside that one? >> it was a diagram of a bomb. coming up -- another victim in the crosshairs? >> keeping that stuff confidential was important to the integrity. >> but the man's life might be in jeopardy. >> we gave him as strong a warning as we could. >> when "family business" continues. if you're 65 or older, even if you're healthy, you may be at increased risk for pneumococcal pneumonia -

>> weird. all too weird. detective salm and the others went home for the weekend to digest what they had just read and seen. and then monday morning, salm's phone rang, 7:00 a.m. >> he says, hey, get in here. we got another one of those letters. i came to work. there was a second letter sitting on my desk. this one was slightly smaller manila envelope or half size. but configured the same way. label maker, address, ayala case, and way too much postage again. >> reporter: huh. what was inside that one? >> it was a diagram of a bomb. coming up, invitation from a killer. >> the letter said, if ...

Detective salm and the others went home for the weekend to digest what they had read and seen. then monday morning his phone rang, 7:00 a.m. >> hey, we got another one of those letters. i came to work. there was a second letter sitting on my desk. this one was slightly smaller manila envelope or half size. but configured the same way. label maker, address, aayala case, and way too much postage again. >> reporter: huh. what was inside that one? >> it was a diagram of a bomb. >> coming up, invitation from a killer. >> the letter said if you have any questions, place an ad in the sacramento bee. ...