DANBURY — Two people were sent to the emergency room to be treated for burns following a car explosion, according to the Danbury Fire Department. Danbury firefighters responded to a rollover accident that resulted in a car explosion around 3:40 a.m. Saturday in the area of 167 Long Ridge Road. Fire officials said that when they arrived the car was already fully engulfed in flames. Two of the car’s occupants were later transported to the Western Connecticut Health Network emergency room to be treated for burns.