This video shows Iranian police throw two suspects in trunk of a police car while another person is already in the trunk of a second police car. I do not know the story behind of arrests in following video.
During arrest Iranian police usually throw suspect into the trunk of car to humiliate and so crush their confidence. Then suspects would be held in temporary custody and during that moment usually will be tortured to confess. This is the process that suspects usually go through since they get arrested. I have to mention that political suspects usually go through process, not necessarily better but different.