Anti-government protesters in Thailand have broken through a gate and forced their way into the prime minister's office compound as police stood by and watched.
Hundreds of protesters poured on to the lawn of Government House, waving Thai flags and blowing whistles.
Earlier, police used cranes to lift the barriers at Bangkok city police headquarters and then let protesters walk past police lines up to Government House.
The unexpected reversal of strategy by the government comes after three days of bitter clashes between police and protesters who want to topple prime minister Yingluck Shinawatra's government.
She was not inside her office, which has been locked since Friday evening.
After bitterly resisting protesters with tear gas and rubber bullets since Saturday, police stood aside as the protesters removed the barriers on a road leading to the prime minister's office and walked through.
The government U-turn suggests it no longer wants to confront the protesters after three days of clashes that have raised concerns about the country's stability. Three people have died and more than 230 injured in various troublespots.
It was also widely expected that some kind of an understanding would be reached to allow the protests to pause for King Bhumibol Adulyadej's birthday on Thursday. The king, who will be 86, is highly revered by all Thais and is seen as the sole uniting figure in the country.
The government did not comment on the developments, and it was not clear if this would provide more than a lull to the violence and the crippling political deadlock that is undermining Thailand's democracy, economy and tourism.
"This is a victory for the protesters," said Kusol Promualrat, who said p olice pulled back "because they know that if this doesn't stop more people will get hurt, more people will die".
Yesterday protest leader Suthep Thaugsuban told his supporters to storm the Bangkok Metropolitan Police Bureau, one of the main buildings they vowed to seize in a campaign to topple the government of prime minister Yingluck Shinawatra.
Ms Yingluck said while she was willing to do anything to end the violent protests, she could not accept Mr Suthep's demand to hand power to an unelected council.
She was elected with an overwhelming majority in 2011 and many observers see the protesters' demand as unreasonable, if not outlandish.
In some of the worst clashes since the protests began last week, demonstrators commandeered dustcarts and bulldozers and tried to ram concrete barriers at Government House and other offices. Police repelled them by firing tear gas, water cannons and rubber bullets, as protesters shot back explosives from home-made rocket launchers.
The protesters, mostly middle-class Bangkok supporters of the opposition Democrat Party, accuse Ms Yingluck of being a proxy for her elder brother, former prime minister Thaksin Shinawatra. He was deposed in a 2006 military coup but remains central to Thailand's political crisis, and is a focal point for the protester's hatred.
The protesters say their goal is to uproot the political machine of Mr Thaksin, who is accused of widespread corruption and abuse of power.
The violence has largely been near Government House, the parliament and Metropolitan Police Bureau in the historic quarter of the capital. The area has some of Bangkok's main tourist attractions such as the Grand Palace, Wat Pho temple and the backpacker area of Khao San Road. Most of Bangkok, a city of 10 million, has been unaffected.
Ms Yingluck and Mr Suthep met briefly on Sunday in the presence of top military leaders, even though he had an arrest warrant against him. A second arrest warrant was issued yesterday on charges of insurrection.
His campaign has raised suggestions he may have the backing of the military, which has long had a powerful influence over Thai politics. The army has often stepped in during times of crisis, carrying out 18 successful or attempted coups since the 1930s.
Political instability has plagued Thailand since the military ousted Mr Thaksin, who remains hugely popular among rural voters, in 2006. Two years later, anti-Thaksin protesters occupied Bangkok's two airports for a week after taking over the prime minister's office for three months, and in 2010 pro-Thaksin protesters occupied downtown Bangkok for weeks in a standoff that ended with parts of the city in flames and more than 90 dead.
Tourism and sports minister Somsak Pureesrisak said a target of 26.5 million tourists for the year may not be met. Tourism contributes 10% to Thailand's £380 billion economy.