An activist at a Sacramento demonstration protesting the police killing of an unarmed black man in his grandmother’s backyard was struck and injured by a Sheriff’s Department vehicle late Saturday as law enforcement officials tried to pass through the crowd.

The Sacramento Bee and The State Hornet newspapers identified the activist as Wanda Cleveland, 61. The Bee described Ms. Cleveland as a regular attendee at City Council meetings. It said she was taken to a hospital with minor injuries and released early Sunday.

“He never even stopped,” the newspaper quoted Ms. Cleveland as saying. “It was a hit-and-run. If I did that I’d be charged.”

Sgt. Kevin Jordan of the Sheriff’s Department said he could not confirm that someone had been hit.

But videos posted on Twitter show sheriff’s vehicles, surrounded by crowds protesting the shooting death last month of Stephon Clark, moving slowly through the crowd as someone urges repeatedly on a megaphone, “Back away from my vehicle.”