Police in Thailand arrested two people yesterday on suspicion of spreading rumours about the health of the country’s 81-year-old king that triggered a slide in stock prices. Thai stocks plunged a combined 7.2 per cent on over two days last month as rumours circulated over the health of King Bhumibol Adulyadej, who has been in hospital for more than a month, before rebounding 3.5 per cent the following day.