Baltimore officer seen in viral video repeatedly punching man quits

A Baltimore police officer has resigned after a video surfaced online showing him repeatedly punching a man and knocking him down over steps on a sidewalk Saturday. The recording lasts about 30 seconds. The city's interim police commissioner said the video "deeply disturbed" him.The video begins with the officer standing in front of a black man who has his back to a wall. The officer, who is also black, can be seen shoving the man in the chest before the officer starts throwing punches. The man