AFP/Jakarta

At least 17 people from a wedding party, including three children, have died in a boat sinking on the way to the Indonesian island of Bali, an official said on Wednesday, with two dozen still missing.

Officials called off the search for the day at sunset, with eight of the 49 people on board rescued, while the remaining 24 were still unaccounted for.

Twelve children are believed to have been among the passengers, though the number has yet to be confirmed.

"The search was called off in the evening because the waves were very big and it was getting dark," said national disaster agency spokesman Sutopo Purwo Nugroho, adding the search would resume Thursday morning.

Among the dead was a two-year-old boy, while the eight survivors were all adults.

The wooden motor boat broke down on Tuesday after leaving from the east of the main island of Java late Monday.

"The engine was damaged and the water pump broke, so the boat filled with water and sank," Nugroho said.

Officials on Tuesday told AFP that the captain managed to briefly call authorities at around noon (0400 GMT) after the boat broke down but lost contact around four hours later.

The passengers on board are all believed to be Indonesian.

The eight survivors were rescued by helicopter, while several boats were deployed by the search team and fishermen were put on alert.

Nugroho did not say whether the bride and groom were on the boat to the resort island, but their family members were believed to be on board, according to reports.

Indonesia relies heavily on boats to connect its more than 17,000 islands, but has a poor maritime safety record.

Boats are often overcrowded and not equipped with enough life jackets and rescue boats.

In August, a tour boat carrying 25 people sank after leaving the island of Lombok near Bali heading toward Komodo Island, a popular tourist destination.

The passengers were mostly European tourists, and two Spanish men were never found after the boat hit a reef and sank in stormy weather, with no working radio or satellite phone to alert rescue officials.

The 18 other foreign tourists on board, as well as four Indonesian crew and one guide, survived the horrific ordeal, some telling of how they were forced to drink their own urine to survive, while others had to swim for long periods.

In July, at least two vessels sank in different parts of the archipelago as millions travelled for the Muslim Eid holiday, leaving at least 36 people dead.