Thailand ? Thailand’s main international airport canceled all flights today as thousands of protesters swarmed the complex in efforts to bring down the government, stranding tourists and dealing a blow to the country’s already-fragile tourism industry.

The airport takeover was one of the boldest gambles yet by the People’s Alliance for Democracy in its four-month campaign to topple Prime Minister Somchai Wongsawat, whom it accuses of being the puppet of a disgraced fugitive predecessor, billionaire Thaksin Shinawatra.

An airport official said several anti-government protesters armed with metal rods entered the control tower, demanding the prime minister’s flight schedule. However, since the airport was shutdown early today, there were no controllers in the tower.