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Protesters on the San Francisco–Oakland Bay Bridge brought traffic to a halt Monday afternoon as the rush hour commute was getting underway.

The California Highway Patrol issued a SigAlert about 3:55 p.m., alerting motorists that the westbound side of the Bay Bridge was blocked just before the Yerba Buena Island tunnel.

Five cars were chained together across the multi-lane highway, with one sign reading, “Black Health Matters.” Another sign stated, “Decriminalize Black.”

The demonstration was carried out by Black.Seed, which identifies itself as a “Black, queer liberation collective,” according to a statement released by the Anti-Police Terror Project.

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