FBI agents say they have been in contact with U.C. Berkeley over the incident which led to President Trump tweeting a threat to pull federal funds from the school.
[Ads /]
Berkeleyside reports that investigators are trying to figure out who caused $100,000 worth of damage at Sproul Plaza.
RELATED: 3 arrested in violent Milo Yiannopoulos protest
Cal blames a group called Black Bloc - who are not students.
[Ads /]
The violence forced the cancellation of a planned speech by the self-proclaimed internet troll.
Yiannopoulos has said he will return to Berkeley to give the speech but hasn't set a date.
PHOTOS: Protests erupt at UC Berkeley's Milo Yiannopoulos event