**Anti-government protesters in Thailand have been marching on an army barracks where the Prime Minister, Abhisit Vejjajiva, is staying.**They have set a deadline of midday for him to resign and call elections - a demand which he has rejected.
Mr Abhisit told local TV he hoped the protests would be peaceful. Some 50,000 soldiers and police have been deployed in Bangkok in response to the rally.
Many of the protesters support ousted former PM, Thaksin Shinawatra.
Thousands of protesters are gathering outside the headquarters of the 11th Infantry Battalion in north Bangkok, and about 3,000 extra soldiers have been sent there to reinforce security.
About 100,000 of the demonstrators held rallies in Bangkok on Sunday.
Political speeches culminated in a video address by Mr Thaksin, who told the crowd they were bringing democracy to Thailand.
The protesters say the present government was installed illegally after Mr Thaksin was ousted in a military coup in 2006, and two subsequent allied governments were deposed by court action.
Riot police and soldiers have been deployed outside Government House and other strategic points.
The military has been given extra powers to impose curfews and restrict numbers at gatherings if necessary.
The last major protests, in April 2009, turned violent, with two deaths and dozens of people injured.
Mr Thaksin is now living in self-imposed exile in Dubai after receiving a two-year sentence in his absence for abuse of power; his supporters says that case was politically motivated.