a later investigation Criminal_investigation , the united states house select committee on assassinations ( hsca ) agreed Agree_or_refuse_to_act with the warren commission that the injuries Bodily_harm that kennedy and connally sustained were caused Causation by oswald 's three rifle shots Use_firearm , but they also concluded Coming_to_believe that kennedy was `` probably assassinated Killing as a result of a conspiracy Committing_crime '' as analysis of a unk audio recording Recording pointed to the existence Presence of an additional gunshot Use_firearm and therefore `` ... a high probability that two gunmen fired Use_firearm at [ the ] president '' .