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The policeman asked what he was doing there and told him the president has been killed. Oswald had little reaction to the statement according to the officer. The policeman search Oswald and found two ID cards with the names Lee Harvey Oswald and Alex Hidell. When the officer asked who he was, Oswald told him to find out himself. The officer dismissed Oswald. It was later found that Alex Hidell was the name Oswald used when he bought the rifle. .
With the above evidence we can see that Lee Harvey Oswald was not the lone perpetrator. There have been some people who believe there were other marksmen in the assassination besides Lee Harvey Oswald in the School Book Depository building. Many although not seeing the "other" marksmen claim they heard shots coming from the grassy knoll. It is also widely believed that Oswald was a decoy and a small part of a larger picture. .
Lee Bowers, a switchman for the railroad yard, surveyed the scene from a glassed-in tower, overlooking the railroad parking lot behind the stockade fence on the grassy knoll. In the hour before the assassination he saw several cars pull in and out of the parking lot. One of the drivers appeared to him as speaking into a hand-held microphone. A few minute before the shooting he observed two men he did not know behind the stockade fence. When the shooting was happening, Bowers notice some "commotion" behind it. .
William Newman was another eyewitness to the attack. He was watching the parade with his family from the curb at the bottom of the grassy knoll. He says that one of the shots came from the grassy knoll, a claim supported by many others. "I though the shot had come from the garden directly behind me I don't recall looking towards the Texas School Book Depository. I looked back in the vicinity of the garden.".
In the photos of Mary Mormon there has been identified that there is a person in the background on the grassy knoll, now known as "badge man".