SAN JOSE, Calif.—A weekend fire gutted a Home Depot store in the San Francisco Bay Area, sending up a huge plume of smoke and prompting orders for some nearby residents to shelter in place, authorities said. The five-alarm blaze in South San Jose erupted around 5 p.m. Saturday and took about six hours to contain shortly before midnight, with some firefighters remaining overnight to douse embers. Employees and customers inside the store ran for safety. No injuries were reported. The fire apparently began in the lumber section of the store but the cause remained under investigation, fire officials said. The fire also fed on flammable materials and chemicals such as paint thinner, which made it harder to fight, Fire Battalion Chief Brad Cloutier said at a briefing. About 100 firefighters fought the blaze and protected nearby homes and businesses. Concerns about unhealthy air prompted authorities to order people living nearby …