San Francisco August 1, 2023 6:52 am Crews battle 4-alarm structure fire in San Francisco Firefighters were battling a four-alarm structure fire Tuesday morning in San Francisco’s Hayes Valley neighborhood, according to the SF Fire Department. US & World Videos 2:01 Huge crowds celebrate Carnaval San Francisco 1:30 Watch: Crowds celebrate Carnaval San Francisco 1:22 Thousands flock to San Francisco's Mission District to celebrate Carnaval 2:21 Alcatraz ferry workers strike amid start of summer tourism season in San Francisco 0:40 Actor Benjamin Bratt receives honorary doctorate degree from San Francisco State