The official story is that the Oklahoma City Bombing was a mass bombing carried out by Timothy McVeigh with the help of Terry Nichols in April 1995. McVeigh was said to be a militia supporter and upset about what had happened in Waco, Texas two years earlier and took his aggression out on the Alfred P. Murrah Federal Building, in Oklahoma City.
Many people don't believe the official story and claim that the bombing was actually a false flag event created to demonize any opposition to the government. People also claim that neither McVeigh or Nicols were connected to any militia groups and that the government said that they were in order to vilify these kinds of groups.
