I think I read the threat was against Florida Power & Light for cutting his juice over non-payment of his bill.
Ah! Here we go:
https://www.sun-sentinel.com/news/florida/fl-ne-cesar-sayoc-arrests-20181026-story.html
From the link:
Suspected mail bomber Cesar Altieri Sayoc Jr. once threatened to blow up a Florida Power & Light building if the utility turned off his power.
The explosion on West Flagler Street in Miami, he promised, would be “worse than 9/11.”
“FPL will get what they deserve,” he says on a recording from 2002.
Yikes. Why was this guy running loose?
I was thinking it could be political but apparently not. He’s just a extreme high pressure type A.
Thanks.