Tens of thousands of anti-government demonstrators have marched on the main government offices in Thailand's capital, Bangkok.

Some 30,000 protesters marched through the city for two hours, urging the government to dissolve parliament and punish those responsible for last year's crippling protests. The earlier demonstrations ousted current Prime Minister Abhisit Vejjajiva's pro-Thaksin predecessor Somchai Wongsawat.

Before dispersing, the demonstrators promised to make their protest permanent, if their demands are not met within 15 days.

More than 5,000 police were deployed to secure the mass protest, which ran from Saturday afternoon into early Sunday.

Last year, yellow-shirted protesters occupied Government House for about three months, and shut down major airports before a coup ousted the government.

Thailand has been wracked by political unrest for years. The country is sharply divided between groups who favor and oppose Mr. Thaksin, who was ousted in a coup in 2006.

Some information for this report was provided by AFP and AP.