A state police helicopter this evening dropped a bomb on a house occupied by an armed group after a 24-hour siege involving gun battles. A 90-minute shootout this morning came after a week of growing tension between the city and the group, known as Move. Residents in the western Philadelphia neighborhood had complained about the group for years. The only known survivors from within the house were a woman and a child. The fire spread to 50 to 60 other houses in the neighborhood, said the Fire Commissioner, William Richmond. He declared the fire under control about 11:40 P.M.