https://www.stripes.com/news/a-soldier-s-roommate-sketched-a-map-to-take-a-neo-nazi-group-they-were-in-down-what-path-officials-took-is-a-mystery-1.557734

Excerpt:

Explosives experts from the Tampa Police Department and the local FBI field office soon found components of a crude pipe bomb as well as radioactive materials. The search turned up ammonium nitrate and nitromethane, the mixture used by McVeigh to destroy the federal building in Oklahoma City in 1995. There were sacks of explosive precursors, including potassium chloride, red iron oxide and potassium nitrate. There were homemade fuses fashioned from brass 5.56 mm rifle cartridges. In a closet, they found two Geiger counters.