** FILE ** Lee Harvey Oswald, suspected assassin of U.S. President John F. Kennedy, holds up his manacled hands at police headquarters in Dallas, Texas, where he is held for questioning, in this Nov. 22, 1963 file photo. New testing on the type of ammunition used in the 1963 assassination of President John F. Kennedy raises questions about whether Lee Harvey Oswald acted alone, according to a study by researchers at Texas A&M University. (AP Photo)