The incident occurred as members of Black Lives Matter demonstrated against police brutality and systemic racism in Yorba Linda.
The Seattle Police Department has placed the officer on leave while the incident is under investigation.
Video posted on social media appeared to show a man opening fire into a Kentucky park as people scrambled for cover.
Authorities are looking into the Greenville incident as possibly gang-related.
Patrick Wood Crusius is facing more than 90 counts under federal hate crime and firearms laws for last summer's shooting at a local Walmart.
“You took from him his only possession: his dignity as a human being,” the judge told John Rabago while sentencing him to four years in prison.
Prosecutors accused Jarrett William Smith of distributing information through social media about building a bomb and making napalm.
Garrett Rolfe's lawsuit was filed the same day that prosecutors filed a motion to revoke his bond, citing an alleged travel violation.
Joseph James DeAngelo appeared in court ahead of sentencing for his crime spree as the East Area Rapist and a notorious serial killer.
The Los Angeles County District Attorney's office said the adult industry star could be sentenced to up to 90 years in prison.