Jakarta - A powerful earthquake and several strong aftershocks hit the Indonesian island of Sumatra, killing at least 25 people, injuring scores and sparking panic, officials and local media said early today. Several buildings in the city of Bengkulu on Sumatra's west coast collapsed and rescuers were searching for people buried in the rubble during the quake on Sunday, police said. A local radio station said 25 deaths had been reported so far.