Fire breaks out at Indonesia's refinery complex (+VIDEO)

Pertamina is making efforts to extinguish the blaze and prevent it from spreading, it said while ensuring the safety of people in the area, the Strait Times reported.

The fire started at around 7.20 pm local time (8.20 pm Singapore time) and the cause is not yet known, Pertamina said.

Mobile phone videos broadcast on local media showed a large blaze, casting the evening sky orange.

"Extinguishing efforts are being carried out intensively on the burning tank, while the surrounding tanks are being cooled with water sprinklers to prevent the fire from spreading," Pertamina said in a statement.