San Diego Police are using surveillance video to help their investigation into a violent attack in South Park. A man attacked another man as he tried to steal an e-bike near the corner of 30th and Grape Street. The surveillance video shows the man dressed in white pants and a white shirt walking along the sidewalk. He approaches a group of people and tries stealing the e-bike. A friend of the e-bike owner grabs the back tire and the man swings at him. MORE: https://www.cbs8.com/article/news/local/video-shows-a-violent-attack-attempted-e-bike-theft/509-f9942fce-2ad4-4ca9-81fe-f6f0aa86def0