Indonesian and Thai authorities raced on Sunday to clear debris and find hundreds of people still missing after devastating floods and landslides that killed at least 480 people across Southeast Asia.

Heavy monsoon rain overwhelmed swaths of Indonesia, Thailand and Malaysia this week, leaving thousands of people stranded without shelter or critical supplies.

At least two cities on Indonesia's worst-affected Sumatra island were still unreachable on Sunday, and authorities said they had deployed two warships from Jakarta to deliver aid.

"There are two cities that require full attention due to being isolated, namely Central Tapanuli and Sibolga," National Disaster agency head Suharyanto said in a statement. The ships were expected in Sibolga on Monday, he said.

The death toll in Indonesia

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