Fans of the St. Louis Symphony got quite a surprise over the weekend when a flash mob interrupted a performance on Saturday to demand justice for Mike Brown, the 18-year-old black man who was shot and killed by white police officer Darren Wilson in nearby Ferguson on August 9.

Just as the conductor took the stage after intermission, a middle-aged black man sang, "What side are you on, friend; what side are you on?"

The St. Louis American, the city’s African-American newspaper, captured the scene on video: 

Acts of civil disobedience have continued in the St. Louis area, with local and national organizers planning several weeks of resistance through a project called Ferguson October.