Strong aftershocks have continued to hit the island since Friday’s earthquake.
Many people were reported trapped in the rubble of buildings that collapsed in Friday’s 7.5-magnitude earthquake, agency spokesman Sutopo Purwo Nugroho told a news conference.
The quake triggered tsunami waves as high as 6m (20ft), he added.
Vice-President Jusuf Kalla said the final death toll could be thousands.
Rescuers have been digging by hand in the search for survivors in the city of Palu.
Indonesia tsunami: Aftershocks rock Palu day after disaster
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