More than 300 people have died and dozens are missing following floods and landslides in Indonesia, which has also been hit by an earthquake.
Monsoon rains over the past week caused rivers to burst their banks in North Sumatra province.
The deluge tore through mountainside villages, swept away people and submerged thousands of houses and buildings, the National Disaster Management Agency said.
As rescue workers continued their efforts on Saturday, the head of the country's disaster mitigation agency said the number of dead had risen to at least 303 people. Authorities fear the figure will increase.
Other Southeast Asian countries including Thailand, Malaysia and Sri Lanka have also been affected by torrential rain in the last week, with authorities working to rescue stranded citizens, restore power and communications and coordinate recovery efforts.
On Friday, the Thai government said 145 people had been killed by flooding across eight southern provinces, while two deaths have also been confirmed in Malaysia. Sri Lanka, in South Asia, has also seen 46 deaths following a cyclone, authorities said.
The extreme weather was driven by tropical cyclone Senyar, which formed in the Strait of Malacca, Indonesia's Meteorology, Climatology and Geophysical Agency said.
Rescuers in Indonesia have been struggling to reach some areas cut off by damaged roads, and where communications lines have come down.
Relief aircraft have been delivering aid and supplies to the hard-hit district of Central Tapanuli in North Sumatra and other provinces in the region.
The agency said West Sumatra's Agam district had also been affected.
Pictures of the rescue efforts show workers trudging through waist-deep mud and areas filled with tree trunks and debris, searching for any victims potentially trapped.
In Aceh province, flooded roads meant authorities struggled to get tractors and other heavy equipment to hilly hamlets which were hit by mud and rocks in the deluge.
Hundreds of police officers, soldiers and residents dug through the debris with their bare hands and spades as heavy rain hindered their efforts.
Meanwhile, a magnitude 6.3 earthquake hit Sumatra island near Aceh province on Thursday, the country's geophysics agency said.
Torrential rain triggered flash flooding and landslides in Sumatra earlier in the week. Videos posted on social media showed water streaming down from rooftops as panicked residents scrambled to safety.
Heavy seasonal rain from about October to March often causes flooding and landslides in Indonesia - an archipelago of more than 17,000 islands including Sumatra - where millions of people live in mountainous areas or near fertile floodplains.
Last week, almost 1,000 people from three villages on Java were forced to flee to shelters after the eruption of Mount Semeru, the island's highest volcano.
(c) Sky News 2025: Indonesia: More than 300 people dead and others missing after floods and landslides
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