On June 1, a largely peaceful demonstration in Seattle turned violent, with police using pepper spray and tear gas against the protesters. Using video and police scanner audio, WSJ dissects how the event unfolded and why it's now under investigation. Photo: Lindsey Wasson/Reuters WSJ video investigations use visual evidence to reveal the truth behind the most important stories of the day. More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com/ Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM #WSJ #Protest #Seattle