San Jose's police department is facing mounting complaints of a tepid and tardy law enforcement response to attacks on Donald Trump supporters after a political rally.
Videos circulating online show physical clashes occurring in front of San Jose police officers dressed in riot gear and standing stoically in a line outside the convention centre where Trump spoke.
Critics also complained that assaults occurred on side streets near the venue that lacked police presence.
"Potentially more could have been done," said San Jose Councilman Pierluigi Oliverio, chairman of the council's public safety committee.
The questions about the San Jose police response came while Trump launched a rally on Friday afternoon in Redding, California, a politically conservative city 350 miles north of San Jose. Trump called those who attacked his supporters on Thursday night a "bunch of thugs".
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San Jose police chief Eddie Garcia commended his officers' response to the violence after the Thursday night rally, saying the 250 officers on hand showed "discipline and restraint".
Garcia said uniformed officers refused to break from their "skirmish line" to break up nearby scuffles because they weren't deemed life-threatening and that "additional force can incite more violence in the crowd".
San Jose police arrested four people on Thursday. One officer suffered minor injuries after a dozen or more people were punched and car windows were broken on Thursday night. Trump hats grabbed from supporters were set on fire on the ground. At least one woman was pelted with an egg.
Police stood their ground at first but after about 90 minutes moved into the remaining crowd to break it up and make arrests.
"Many of the attendees were attacked out in the open," said Pete Constant, a former San Jose councilman and former police officer.
"It appears that law enforcement was more focused on protecting private property."
Thursday night's crowd, which had numbered over 300 just after the rally, thinned significantly as the night went on, but those who remained near the San Jose Convention Center were rowdy and angry.
Some banged on the cars of Trump supporters as they left the rally and chased after those on foot.
San Jose Mayor Sam Liccardo, a Democrat and Hillary Clinton supporter, criticised Trump for coming to cities and igniting problems that local police departments had to deal with.
"At some point Donald Trump needs to take responsibility for the irresponsible behaviour of his campaign," Liccardo said.
