Several hundred demonstrators massed outside Rancho Cucamonga City Hall before marching down Foothill Boulevard.
They carried American flags galore and signs that read "we support and pray for our police."
The march was a part of a national pro-police rally on Saturday in the wake of mounting calls to defund the police.
LAPD investigating use-of-force incident caught on video involving man in wheelchair during protest
LAPD investigating use-of-force incident involving man in wheelchair during protest