@BillW,
Ammonium nitrate is the same material used in the Oklahoma City Murrah Federal Building bombing on April 19, 1995. Timothy McVeigh, an avowed White Supremacist, detonated 4,800 pounds of fertilizer:
"The Oklahoma City bombing was a domestic terrorist truck bombing of the Alfred P. Murrah Federal Building[1] in Oklahoma City, Oklahoma, United States, on April 19, 1995. Perpetrated by American terrorists Timothy McVeigh and Terry Nichols, the bombing happened at 9:02 am and killed at least 168 people, including many children,[2] injured more than 680 others, and destroyed more than one third of the building, which had to be demolished.[3] The blast destroyed or damaged 324 other buildings within a 16-block radius, shattered glass in 258 nearby buildings, and destroyed or burned 86 cars,[4][5] causing an estimated $652 million worth of damage.[6] Local, state, federal, and worldwide agencies engaged in extensive rescue efforts in the wake of the bombing. They and the city received substantial donations from across the country. The Federal Emergency Management Agency (FEMA) activated 11 of its Urban Search and Rescue Task Forces, consisting of 665 rescue workers who assisted in rescue and recovery operations.[7][8] Until the September 11 attacks in 2001, the Oklahoma City bombing was the deadliest terrorist attack in the history of the United States. It remains the deadliest act of domestic terrorism in U.S. history. "
https://en.m.wikipedia.org/wiki/Oklahoma_City_bombing
