Officials say an illegal oil operation has caught fire on Indonesia's island of Sumatra, killing at least four people and injuring more than a dozen others.

Ali Mundakir, spokesman for Indonesia's state-owned oil company Pertamina, says flames shot high into the air early Wednesday at a storage reservoir holding crude oil that had been illegally siphoned off a pipeline in South Sumatra's Musi Banyuasin district.

Local police spokesman Lt. Col. R. Djarod Padakova says the raging fire caused a loud roaring noise, panicking villagers living nearby. More than a dozen people were rushed to a nearby hospital.

Padakova says there's no immediate information about the cause of the accident, which is under investigation. The fire was extinguished after burning for several hours.