... Ruby's shooting of Oswald was not a spontaneous act, in that it involved at least some premeditation. Similarly, the committee believed it was less likely that Ruby entered the police basement without assistance, even though the assistance may have been provided with no knowledge of Ruby's intentions ... The committee was troubled by the apparently unlocked doors along the stairway route and the removal of security guards from the area of the garage nearest the stairway shortly before the shooting ... There is also evidence that the Dallas Police Department withheld relevant information from the Warren Commission concerning Ruby's entry to the scene of the Oswald transfer.