Moments after Sanders took the stage at Westlake Park, two women and one man climbed the stage and confronted the Democratic presidential candidate, demanding a chance to speak.
After several moments of confusion and confrontation, an event organizer took the microphone and said the protesters would be allowed to speak before Sanders. Some in the crowd booed.
One protester, who identified herself as Marissa Johnson, began by saying, "I was going to tell Bernie how racist this city is — with all of its progressives — but you've already done that for me. Thank you."
Johnson spoke, among other things, about police violence in Seattle, mentioning a federal investigation into the city's law enforcement that resulted in the appointment of a monitor to make sure Seattle police were complying with the terms set forth by the Justice Department.
"Bernie says that he's all about the people and about grassroots. The biggest grassroots movement in this country right now is Black Lives Matter," she added.