Bangkok - Anti-government protestors closed down Hat Yai International Airport Tuesday in a show of solidarity for fellow demonstrators in Bangkok which has been put under martial law.

Supporters of the People's Alliance for Democracy (PAD), which has occupied Government House in Bangkok for the past week, blocked the entrance gates to Hat Yai airport Tuesday, prompting authorities to suspend flights.

Thai Airways International and the no-frills Nok Air were forced to cancel four afternoon flights between Bangkok to Hat Yai, 730 kilometres south of Bangkok, because of the closure.

On Tuesday Thai Prime Minister Samak Sundaravej declared the capital under a state of emergency after pro-government and anti-government groups clashed in a pre-dawn street battle that left one person dead and 44 injured.

Thousands of PAD followers seized Government House on August 26 and have occupied Thailand's seat of government since.

The protesters are demanding the resignations of Samak and his cabinet, whom they accuse of corruption and acting as nominees for coup-ousted former premier Thaksin Shinawatra.

Thai Army Commander in Chief General Anupong Paojinda said the military will not use force to oust the protestors, comprising mostly middle class Thais and many women, despite the state of emergency.

An attempt by police to use force ousting the PAD prompted the movement's followers in Hat Yai, Krabi and Phuket to close down airports in the three provinces on Friday.

Hat Yai Airport reopened Saturday and Krabi and Phuket were operational again on Sunday. (dpa)