A Baltimore police officer has been suspended after a video showed him punching a woman and knocking her out after she confronted another officer. The police department said on Saturday that Commissioner Michael Harrison has also ordered an investigation of the incident. The video, posted on social media, shows a black woman confronting a white police sergeant in a downtown intersection on Friday night. When the sergeant grabs the woman's arm, she strikes the sergeant twice on his head. It was then that another officer, who is black, coldcocks the woman from behind and appears to knock her out cold.