"The rescue process is difficult because the two bridges ... to the villages collapsed," he said.

"The other way to reach the affected area is by sea using speed boats, but strong weather ... is making that difficult."

Rustam Pakaya, the head of the health ministry crisis centre, said a rescue team had been sent to the flood-hit area, but was not expected to arrive until the evening.

Floods and landslides are common in Indonesia, which is densely populated and prone to frequent heavy rains.