The Thai Navy says 31 sailors are missing after a warship carrying over 100 crew capsized and sank during a storm in the Gulf of Thailand.

The HTMAS Sukhotai sank after water flooded its power controls on Sunday night.

Authorities said on Monday they had rescued 75 crew but 31 were still missing in rough seas.

The navy said search crews worked through the night to find survivors, and the operation was continuing on Monday.

They also announced an investigation into the cause of the disaster.