Red flags are being flown along the beaches in the Hat Noppharat Tara Mo Ko Phi-Phi National Park, to warn tourists not to swim in the sea due to strong winds.

A small speed boat, belonging to a naval officer, capsized at about noon today, about 300 metres from Hong Island, but all eight people on board are safe after being plucked from the sea by a tour boat from Phuket and being put ashore on Hong Island.

It is reported that all eight people wore life vests.

Mana Nualwan, the chief marine official in Krabi, said he had told all tourist boat operators to equip their boats with life-saving equipment and to ensure all the passengers wear life vests while on board.

Meanwhile, in the southern province of Surat Thani, a British tourist is reported to have gone missing this afternoon while kayaking, after he fell into the reservoir behind Rajjaprabha (Cheow Lan) Dam in Ban Ta Khun district.