About 60,000 pounds of ammonium nitrate, a chemical used as a fertilizer and in explosives, went missing on a rail shipment from Wyoming to California in April 2023 and has still not been found, officials said.

https://x.com/BabyD1111229/status/1768630738964926866

https://en.wikipedia.org/wiki/List_of_ammonium_nitrate_incidents_and_disasters