Leaders of the anti government protests in Thailand have surrendered to police on charges of inciting unrest but were immediately bailed and have vowed to continue their protest.

Seven leaders of the People's Alliance for Democracy (PAD) turned themselves in to police after charges of treason against them were quashed by the Court of Appeal on Thursday, but after 90 minutes they were freed.

Everything is done. There is no detention," Sondhi Limthongkul, the head of the PAD, told reporters after his release.

The original arrest orders for treason were issued on August 27, the day after PAD protesters armed with golf clubs, stakes and machetes stormed a state television station, broke into ministries and overran the prime minister's official compound.

They have been at Government House ever since, making it the heart of a long-running anti-government campaign that spilled over into running battles with riot police this week when thousands of protesters marched on parliament to try and stop a speech by the new Prime Minister Somchai Wongsawat.

Two people died and 400 were injured, including several police officers, during the worst street violence in Bangkok in years.

Efforts by Mr Somchai to end the months-long campaign against his party have so far failed, and pressure is mounting on army chief Anupong Paochinda to launch another military coup, although he has stressed repeatedly that it would do nothing to defuse the underlying political tensions.

However this might be the only solution, the country's former deputy prime minister has admitted.

"A House dissolution cannot solve the problem," Chavalit Yongchaiyudh told the Bangkok Post.

"I see (the answer in) a putsch. After the military steps in, power should be immediately returned to the people and an interim government can be formed in which every party takes part," said Mr Chavalit, who resigned as deputy premier in the wake of the riots on Tuesday.

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