BANGKOK - ARRIVALS of foreign tourists in Bangkok are down 30 per cent, the Association of Thai Travel Agents said on Thursday, blaming the drop on a state of emergency declared three days ago in the capital.

Bangkok's international airport normally receives an average of 8,000 to 10,000 foreign visitors a day, the group's president, Apichart Sankary, told AFP.

But arrivals now are 30 per cent below average, he said.

'The political turmoil has badly affected the travel and tourism business in Thailand,' Mr Apichart said, adding that 13 countries have issued warnings about travel here.

He said the fall-off in arrivals began after Prime Minister Samak Sundaravej declared a state of emergency in Bangkok on Tuesday following bloody clashes between rival activists that left one of Samak's supporters dead.

The decline is already costing Thailand 400 million baht (S$16.7 million) a day in lost revenue, Mr Apichart said. On an average day, the country earns about 1.5 billion baht from tourism.

'Most of the foreign visitors are tourists who expect to have a good time in Thailand. If the government cannot resolve the problems properly and quickly, we may see a weaker future for the business,' he said.

Last weekend anti-government protesters calling for Samak's resignation shuttered three key tourist airports for two days, stranding thousands of travellers. Rail services in southern Thailand have also been disrupted for a week.

Mr Apichart said the closure of the airport in Phuket alone caused losses of about 750 million baht.

Tourism generates about six per cent of the national economy, and Thailand had expected the industry to earn about 600 billion baht this year.

But industry groups fear the ongoing protests could spark even more cancellations, just as the peak tourism season here begins in October.