Police officers clash with a protester on the fourth night of demonstrations Dec. 6, 2014, in Berkeley, Calif., over recent grand jury decisions in police-involved deaths of unarmed black men.
Stephen Lam/Getty Images

A nationwide peaceful protest movement designed to shine the spotlight on police violence in the black community turned violent in Berkeley, Calif., late Saturday as demonstrators smashed windows and threw rocks and bricks at officers, the Associated Press reports.

Several officers were struck, but there were just two reports of injury, Berkeley police spokeswoman Jenn Coats said, according to AP. A Berkeley police officer received hospital treatment for a dislocated shoulder after being hit with a sandbag, while another sustained minor injuries, the report says.

Coates also told the news outlet that several businesses were vandalized, including Trader Joe's, Radio Shack and a Wells Fargo Bank branch. Some squad cars were also damaged.

Most protests have been peaceful since demonstrators around the country—from California to New York to Florida—staged die-ins, blocked roadways and marched into stores to protest grand jury decisions not to indict two white officers in the recent deaths of two unarmed black men: Eric Garner in New York City and Michael Brown in Ferguson, Mo.

Last week a grand jury decided against prosecuting the officer involved in Garner’s death—Daniel Pantaleo—reviving protests nationwide nearly a week after a grand jury declined to bring charges against now-former Ferguson Officer Darren Wilson in the shooting death of Michael Brown.

Read more at the Associated Press.