SILVER SPRING, Md.—Ten people were taken to hospitals and several remain unaccounted for following an explosion and fire at a Maryland apartment building Thursday morning, authorities said. Firefighters responded to the Friendly Garden Apartments in Silver Spring, just outside Washington, D.C., about 10:30 a.m. Video footage from a nearby resident’s outdoor security camera shows an explosion obliterating an end unit of one building. Steven Inman was cooking in a nearby apartment when he heard the blast. “We heard the bang, loud shake. I see that the building is gone. My father yells out to me and I was already running over here,” he said. Inman said he helped a woman and her small child get out of the building found another woman with third-degree burns over much of her body. Montgomery County Fire and Rescue Service Chief Scott Goldstein said 10 people were taken to the hospital, three with serious …