A small number of protesters gathered at United Nations Plaza on Saturday afternoon protesting censorship by big tech companies such as Facebook and Twitter. More than 100 left-wing activists showed up at the demonstration in a counter-protest that quickly grew violent, according to The Mercury News.

The San Francisco Police Department provided a summary of the clash:

Within minutes of the rally beginning opposition demonstrators began throwing glass bottles, plastic bottles filled with an unknown liquid, metal cans, and eggs at free speech rally participants and law enforcement personnel. Opposing demonstrators rushed the established barricade line in an attempt to knock it over thereby putting the safety of participants and officers at risk. One free speech rally participant was assaulted during the incident. The rally became so violent in nature it was declared a public safety hazard and was shut down.