Dozens of people died in floods and landslides in Indonesia and its neighbor, East Timor, according to local authorities, who said the death toll was likely to rise.

A spokesman for the National Agency for Combating Disasters, Raditia Gati, told AFP that there are 44 deaths and 9 injured on the eastern island of Flores.

"At least 49 families have been affected by the floods in Flores, in eastern Indonesia," said Raditya Jati, a spokesman for the disaster management agency.

"Dozens of homes were buried under the mud in the village of Lamanelli ... the floods washed away the residents' homes," he added in a statement, referring to the eastern part of the island.

He said that a bridge collapsed on the island of Adunara to the east, as rescuers were facing torrential rain, winds and heavy waves.

In neighboring East Timor, the state news agency Tatuli reported that 8 people died in a landslide on the outskirts of the capital, Dili.

The electricity supply was cut off and the presidential palace was flooded, while the capital, Dili, witnessed torrential rains and strong winds late on Saturday evening.

Social media posts showed collapsed buildings and cars inundated with flood waters.