Police said in a news release Saturday that the officer placed on leave is in addition to another officer placed on leave last week and two officers who have been reassigned.
Police again declined to name the officers involved.
Police Chief Todd Schmaderer ordered an internal investigation a day after a video turned up online showing an officer grabbing 28-year-old Octavius Johnson from behind, violently throwing him to the ground and punching him while he was restrained.
The March 21 arrest was secretly recorded by a neighbor. The arrest happened after officers responded to an on-going parking complaint in a north Omaha neighborhood.