In contrast to the testimony of the witnesses who heard and observed shots fired from the Depository, the Commission’s investigation has disclosed no credible evidence that any shots were fired from anywhere else. When the shots were fired, many people near the Depository believed that the shots came from the railroad bridge over the Triple Underpass or from the area to the west of the Depository.[C3-57] In the hectic moments after the assassination, many spectators ran in the general direction of the Triple Underpass or the railroad yards northwest of the building. Some were running toward the place from which the sound of the rifle fire appeared to come, others were fleeing the scene of the shooting.[C3-58] None of these people saw anyone with a rifle, and the Commission’s inquiry has yielded no evidence that shots were fired from the bridge over the Triple Underpass or from the railroad yards. On the day of the motorcade, Patrolman J. W. Foster stood on the east side of the railroad bridge over the Triple Underpass and Patrolman J. C. White stood on the west side.[C3-59] Patrolman Joe E. Murphy was standing over Elm Street on the Stemmons Freeway overpass, west of the railroad bridge farther away from the Depository.[C3-60] Two other officers were stationed on Stemmons Freeway to control traffic as the motorcade entered the Freeway.[C3-61] Under the advance preparations worked out between the Secret Service and the Dallas Police Department, the policemen were under instructions to keep “unauthorized” people away from these locations.[C3-62] When the motorcade reached the intersection of Elm and Houston Streets, there were no spectators on Stemmons Freeway where Patrolman Murphy was stationed.[C3-63] Patrolman Foster estimated that there were 10 or 11 people on the railroad bridge where he was assigned;[C3-64] another witness testified that there were between 14 and 18 people there as the motorcade came into view.[C3-65] Investigation has disclosed 15 persons who were on the railroad bridge at this time, including 2 policemen, 2 employees of the Texas-Louisiana Freight Bureau and 11 employees of the Union Terminal Co.[C3-66] In the absence of any explicit definition of “unauthorized” persons, the policemen permitted these employees to remain on the railroad bridge to watch the motorcade. (See chapter VIII, pp. 446-447.) At the request of the policemen, S.M. Holland, signal supervisor for Union Terminal Co., came to the railroad bridge at about 11:45 a.m. and remained to identify those persons who were railroad employees.[C3-67] In addition, Patrolman Foster checked credentials to determine if persons seeking access to the bridge were railroad employees.[C3-68] Persons who were not railroad employees were ordered away, including one news photographer who wished only to take a picture of the motorcade.[C3-69]