Indonesian and Thai authorities raced on Sunday to clear debris and find hundreds of missing people as the death toll from devastating floods and landslides across Southeast Asia topped 600.

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

Central Tapanuli and Sibolga city "require full attention due to being isolated", National Disaster agency head Suharyanto said in a statement, adding that the ships were expected in Sibolga on Monday.

The death toll in Indonesia rose to 442, while 402 were still mi

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