Authorities Monday expanded an existing border-area ocean-pollution alert north to include Silver Strand State Beach.
The warning initially was issued after recent storms caused rain-driven sewage to enter the United States from Baja California via the Tijuana River, fouling the surf off the coast of Tijuana Slough National Wildlife Refuge and Imperial Beach, according to the San Diego County Department of Environmental Health.
Signs cautioning of contamination hazards will stand in the affected areas until follow-up testing deems them safe again for recreational uses.
