Thai riot police have clashed with anti-government protesters who stormed the Thai prime minister's office compound in Bangkok.
Hundreds of officers briefly confronted the intruders at Government House.
Earlier, thousands of demonstrators invaded government buildings and a state-run TV station.
The protesters say Prime Minister Samak Sundaravej is a proxy for ex-PM Thaksin Shinawatra, who was ousted in a 2006 coup and is now in self-imposed exile.
After the intruders ignored a deadline to leave the prime minister's headquarters, hundreds of riot police moved in during the early hours of Wednesday morning.
They clashed briefly with the protesters, but fighting stopped a few minutes after officers secured the inside of the compound.
Scuffles
Deputy police spokesman Major General Surapol Tuanthong told the AFP news agency a few police and protesters had received minor injuries during scuffles.
Eyewitnesses said the police made no immediate effort to force them out, and appeared to be holding talks with the protest leaders.
Thousands of protesters near Government House in Bangkok on Tuesday
The protesters - many clad in yellow as a mark of loyalty to Thailand's revered King Bhumibol Adulyadej - had scaled fences to enter the grounds of Government House.
This forced the prime minister to move to military headquarters elsewhere in the capital.
The demonstrations had started early on Tuesday as more than 30,000 protesters marched through Bangkok's streets.
The masked supporters stormed the main studios of the government-run National Broadcasting Services of Thailand (NBT) and at least three government ministries.
Coup plot claim
Mr Samak, whose government retains a clear parliamentary majority following his election last December, had earlier accused the protesters of trying to foment another coup.
The unrest is the latest in a series of shows of force staged by the People's Alliance for Democracy (PAD) over recent months.
The prime minister has been unable to tame the protests, raising suspicions the organisers may have powerful backers in the armed forces or the royalist elite, say correspondents.
In a TV interview on Tuesday, army chief Anupong Paochinda insisted there would be no attempt to oust the government.
Despite its name, the People's Alliance for Democracy is actually campaigning for an end to democracy, says BBC Bangkok correspondent Jonathan Head.
It wants a largely appointed parliament, and a legalised role for the military as a kind of referee in Thai politics, he adds.
The PAD began three years ago as a movement to bring down Thaksin Shinawatra, then the most powerful elected leader Thailand had ever known.