At least 11 people were killed and 40 injured on Wednesday after a fire broke out in an oil well in the Indonesian province of Aceh in Sumatra, officials said.Five buildings burnt down in the fire that erupted early in the morning during an extraction process in Pasir Puti village when several workers were cleaning up an oil spill due to overproduction, said National Disaster Management agency spokesperson Sutopo Purwo.Efforts were underway to bring the blaze under control, the spokesperson was quoted as saying by Efe news.Indonesian authorities, firefighters and state-owned energy company Pertamina were jointly working to extinguish a column of fire more than 10 meters high, according to images released by the disaster agency.An investigation was launched to determine the cause of the blaze.