First responders battle a massive fire that erupted at a warehouse early Saturday, May 23, 2020 in San Francisco. (KPIX-TV CBS-Viacom via AP)SAN FRANCISCO A fire engulfed a warehouse on San Francisco's Fisherman's Wharf early Saturday, sending a thick plume of smoke over the waterfront and threatening to spread to a historic World War II-era ship before firefighters brought the flames under control. One firefighter sustained a hand injury while battling the fire at the warehouse the size of a football field on Pier 45, San Francisco Fire Lt. Jonathan Baxter said. However, at least two workers told the San Francisco Chronicle they were inside the fish processing and storage warehouse when the fire broke out before dawn. More than 130 firefighters fought the flames, with some using ladder trucks to drench the warehouse from above.