Mr. Davis heard a sound which he described as similar to firecrackers exploding. He stated they did not sound like rifle fire because they were not loud enough. All shots were very close together and he stated it was impossible for him to determine the number of shots. He stated his first impression was that someone had played a prank, but then he saw guns in the hands of the Secret Service Agents with President Kennedy, saw President Kennedy slumped forward, and the police motorcycle escort maneuver swiftly about the area and he realized it as not a prank. [FBI report does not reveal if Davis was asked where he thought the shots came from.]