The Concord Police Department issued an alert after they received calls about roving aggressive bees in the neighborhood during the weekend.
The incident occurred on Concord's Hitchcock Drive, where police say an amateur beekeeper accidentally loosed the swarm on Saturday.
The pests stung several children and even killed two dogs.
A local veterinarian told CNN affiliate KPIX both dogs had more than 50 stingers lodged in their bodies.
The bees were so bent on destruction, a resident was stung on-camera during an interview with the TV station.
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One resident's video of the scene shows especially loud and boisterous bees slamming against a porch screen.
The keeper who helped contain the bees told the channel that he believes the Concord beasts are Africanized killer bees, which explains their apparently ferocious attacks.
The police and the homeowner worked together with a local beekeeper to confine the bees, and by Sunday morning an updated police alert reported a "significantly reduced" number of bees in the area.