Although officials assured that the oil particles do not pose a health threat, Prachuab Khiri Khan governor Thavee Narissirikul took a cautious step by warning tourists and holidaymakers against swimming in the sea for 1-2 days until the situation has returned to normal.
Meanwhile, officials concerned are collecting information about tankers which left Samut Sakhon, Petchaburi and Prachuab Khiri Khan in October in an effort to find out the culprit or culprits which illegally discharged oil into the sea.
Specimens of the oil slicks have been sent to an overseas laboratory to determine the exact type of the oil which could help trace the culprits.
It was reported that small patches of thick black oil have been washed ashore in Hua Sai district of Nakhon Si Thammarat and Singha Nakhon district of Songkhla.
Villagers of the two district suspected that the oil slicks came from an oil rig in the Gulf.