Vancouver police say they are investigating two violent confrontations at a rally in the city marking International Transgender Day of Visibility. Investigators have released images of two people, as well as video from Grandview Park that shows the two people involved in incidents where others were shouted at, grabbed, and thrown to the ground. VPD says the video and images it posted online come from a victim. Police is making them public with the hope that more people who witnessed the altercations will come forward with information. “Investigators believe there may be additional witnesses who have not spoken to police, as well as bystander video that may show different perspectives of what occurred,” said a release from VPD. VPD detectives are reviewing bystander video, eyewitness accounts and victim statements from the event. Police estimate between 75 and 100 people attended the rally at the park, including those who were there to protest the event. Police say they believe at least two people were assaulted.