The bombing of the federal Murrah office building was blamed by federal authorities on a bomb made from fertilizer inside a truck parked in front of the building by Timothy McVeigh and Terry Nichols.
There are many anomalies associated with the official explanation, including mysterious deaths of some, including a police officer, who understood that the actual facts did not accord with the explanation. Investigators who report the actual facts are branded "conspiracy theorists" and dismissed. This has been the Deep State's way of controlling explanations since the 1940s.
Americans, being the insouciant people that they are, never noticed that the Murrah building blew up from the inside out, not from the outside in.