Here is video showing the riot police showing up at a peaceful Tea Party earlier today. Gateway Pundit is reporting that his sources say that the Secret Service are responsible for calling the Quincy police and asking them to send in the riot police. He also has some pictures of the "threatening" protesters.
Gateway Pundit:"From our sources– A call came from inside the convention center to the Quincy police. The Secret Service unleashed the riot police on the tea party patriots."