Another investigation was done by the United States House Select Committee on Assassinations (HSCA) in 1979. They found that President John F. Kennedy was probably killed as a result of a conspiracy (a secret plot). The HSCA found both the original FBI investigation and the Warren Commission Report to have big mistakes. They agree with the Commission that Oswald fired all the shots. But they say that there were at least four shots fired. They also say that it was very likely that two gunmen fired at the President. No gunmen or groups involved in the conspiracy were pointed out by the committee. They said that the CIA, the Soviet Union, organized crime and several other groups were not involved.