At least two workers were confirmed dead when an Amazon.com Inc. warehouse collapsed near St. Louis after tornadoes and strong storms roared through the area late Friday, local authorities said. Several people remained unaccounted for as rescuers frantically searched for workers who may be trapped in the facility in Edwardsville, Illinois, Police Chief Mike Fillback told reporters. He said about 50 workers were believed to be at the warehouse when it was hit by an extreme “weather-related event” at about 8:30 p.m. Friday. At least 30 workers were transported by bus from the scene and others may have left on their own, Fillback said. He said it had been difficult to get an exact number of workers who might be unaccounted for because the warehouse did not have “a set staff.” Drone footage from the scene showed rescue workers picking through a huge area of debris in the pre-dawn darkness. …