Suryaman, based on the island of Lombok, told Reuters that 10 people had been rescued after the ship sank on its way from that island to Komodo Islands.
He said he did not know the fate of the other 15 people on the vessel, which had a crew of five Indonesians and was carrying 20 foreigners.
The vessel left Lombok on Thursday night and sank on Saturday about 7pm local time "and we only received a report at 8 am (on Sunday)," said Suryaman, adding that poor communication caused a delay in deploying a search-and-rescue team.
Local fishermen rescued five people before the team arrived, he said.
Komodo Island in Indonesia is the home to the Komodo dragon, the world's largest lizard, which makes it a major tourist attraction. (Getty Images file photo)
The official said that of the 10 rescued people, the nationalities were known for five — two each from New Zealand and Spain, and one from Britain.
Tajudin Sam, who runs the tour company operating the boat, said it likely encountered stormy weather.
A boat ride from Lombok to Komodo can take three days.
Komodo is famous for its Komodo dragon, the world's largest lizards, which draw many tourists.
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