Bangkok - Thai shares fell 3.85 per cent Wednesday on worries about a global economic slowdown and fighting on the Thai-Cambodian border.
The Stock Exchange of Thailand index closed at 481.5, down 19.27 points.
"Investors were concerned that the US bail-out measures will result in a global economic slowdown," said Mongkol Phuangphatha, an analyst at Adkinson Securities.
"Then there was news of fighting on the Thai-Cambodian border, which didn't help any," he added.
Thai and Cambodian troops briefly exchanged rifle fire Wednesday afternoon, resulting in at least one minor casualty on the Thai side.