Yudiarso said it would take at least three weeks for the necropsy test to be concluded but forensic experts found some bleeding in the whale's lungs and its colon was filled with fluids.
Police have cordoned off the location to prevent people from stealing the mammal's meat or body parts.
In 2018, a sperm whale was found dead in Indonesia with more than 100 plastic cups and 25 plastic bags in its stomach, raising concerns about the Southeast Asian archipelago's massive marine rubbish problem.
Indonesia is the world's second-biggest contributor to marine debris after China.
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