San Francisco, San Mateo fall back to Covid-19 purple tier

San Francisco and San Mateo counties on Saturday officially landed on purple tier, the state's most restrictive category for Covid-19 with "widespread" risk, bringing new restrictions on businesses. That leaves Marin County as the only jurisdiction in the Bay Area that remains on the red tier, where Covid-19 is deemed "substantial." San Francisco Mayor London Breed said on Twitter that beginning at noon Sunday gyms, movie theaters, museums and houses of worship must cease all indoor service. Gyms…