From the mayor on down to the officer on scene, the cover-up seems pretty big. Multiple false reports are very worrisome. Though a detective taking a statement from Van Dyke shouldn't qualify as another false report. But Van Dyke's partner, Walsh, is certainly culpable.
Update: The New York Times says "at least five other officers on the scene that night corroborated a version of events similar to the one Officer Van Dyke."