Authorities say 79 people remain missing and thousands of families have been displaced from their homes across Sumatra.

The death toll from floods and landslides on the western Indonesian island of Sumatra this week has risen to 174, a disaster official said, with about 80 more people still missing, as a punishing tropical storm system and heavy monsoon rains have battered the region.

“As of this afternoon, we have recorded that for the entire North Sumatra province, there have been 116 deaths and 42 people are still being searched for,” National Disaster Mitigation Agency (BNPB) chief Suharyanto announced on Friday.

He said another 35 were killed in the island’s Aceh province and another 23 in West Sumatra.

While the rain had stopped, 79 people were still missing and thousands of families were displaced, he added.

Residents in Sumatra’s Padang Pariaman region, where a total of 22 people died, had to cope with water levels at least 1 metre (3.3ft) high, and had still not been reached by search and rescue personnel on Friday.

In the town of Batang Toru, in northern Sumatra, residents on Friday buried seven unclaimed victims in a mass grave. The decomposing bodies, wrapped in black plastic, were lifted from the back of a truck onto a wide plot of land as onlookers covered their noses.

Communications remained down in some parts of the island, and authorities were working to restore power and clear roads blocked by landslide debris, said Abdul Muhari, spokesman for Indonesia’s national disaster mitigation agency.

Indonesia would continue to airlift aid and rescue personnel into stricken areas on Friday, he added.

In Indonesia’s West Sumatra province, 53-year-old Misniati described a terrifying battle against rising floodwaters to reach her husband at home.

She said that, returning from early morning prayers at a mosque, “I noticed the street was flooded.

“I tried to run back to my house to tell my husband, and the water was already reaching my waist,” she told the AFP news agency, adding that it was up to her chest by the time she reached home.

Flooding disasters elsewhere in Asia

Meanwhile, in Thailand, the government said 145 people had been killed by floods across eight southern provinces. It said a total of more than 3.5 million people had been affected.

In the southern city of Hat Yai, the hardest-hit part of Thailand, the rain had finally stopped on Friday, but residents were still ankle-deep in floodwaters, and many remained without electricity as they assessed the damage to their property over the last week.

Some residents said they were spared the worst of the floods but were still suffering from their effects.

In neighbouring Malaysia, where two people have been confirmed dead, tropical storm Senyar made landfall at about midnight and has since weakened.

Meteorological authorities are still bracing themselves for heavy rain and wind, and warned that rough seas could pose risks for small boats.

A total of 30,000 evacuees remain in shelters, down from more than 34,000 on Thursday.

Malaysia’s Ministry of Foreign Affairs said on Friday that it had already evacuated 1,459 Malaysian nationals stranded in more than 25 flood-hit hotels in Thailand, adding that it would work to rescue the remaining 300 still caught up in flood zones.

Separately, at least 56 people were killed by a cyclone in the South Asian island nation of Sri Lanka, authorities said.