Berkeley Police ask for help ID-ing 'rioters' from April 15

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Berkeley Police are releasing photos of three men who they say committed violent assaults, during a demonstration at Civic Center Park last month. 

Investigators are hoping someone will recognize these three men and contact police. 

Officials say they also want people to come forward with any other videos or photos of people who may have committed crimes during the demonstration. 

Police arrested at least 20 people on April 15 in clashes between supporters and opponents of Donald Trump.