The ten-month investigation of the Warren Commission of 1963-1964 concluded that the President was assassinated by Lee Harvey Oswald acting alone and that Jack Ruby acted alone when he killed Oswald before he could stand Trial. 80 percent of Americans have suspected that there was a plot or cover-up. Contrary to the Warren Commission, the United States House Select Committee on Assassinations (HSCA) in 1979 concluded that President John F. Kennedy was probably assassinated as a result of a conspiracy. The HSCA found both the original FBI investigation and the Warren Commission Report to be seriously flawed. While agreeing with the Commission that Oswald fired all the shots which caused the wounds to Kennedy and Governor Connally, it stated that there were at least four shots fired and that there was a high probability that two gunmen fired at the President.