BANGKOK (Agencies) - Thousands of anti-government protesters besieged the Thai Prime Minister's office Tuesday to demand snap elections, unleashing fresh political turmoil days before the kingdom hosts a key summit. Red-shirted demonstrators loyal to ousted premier Thaksin Shinawatra called on Prime Minister Abhisit Vejjajiva to dissolve his two-month-old government, and said they would camp out at Government House for at least three days. Demonstrators shouting "We don't want this government" broke through barbed wire barricades manned by hundreds of police and soldiers and took control of the roads around Government House, an AFP correspondent said. The so-called "Red Shirts" have campaigned against the government since a court dissolved the pro-Thaksin former ruling party in December, paving the way for British-born Democrat Party leader Abhisit to take power. "We are ready to stay, whether it is three days, seven days, one month or one year," said Jatuporn Prompan, one of the protest leaders. Readying for a night on the streets, protesters constructed tents, food stalls and a stage outside the gates of the compound. The rally has already forced Abhisit to move his weekly Tuesday cabinet meeting to the beach resort of Hua Hin, where he will host a summit of Association of Southeast Asian Nations (ASEAN) leaders from Friday. Abhisit insisted that he would go to work at Government House on Wednesday as usual. "I can walk in but protesters must be unarmed," he said. "Protesters said they will not obstruct officials from working. Core leaders must give assurances that protesters will comply with their promise." Police said around 20,000 flag-waving demonstrators dressed in signature crimson T-shirts had massed outside Government House after travelling on motorbikes, trucks and on foot from a downtown Bangkok parade ground. Some tried to overturn a police truck before a group carrying hammers and wirecutters broke through the huge coils of razor wire sealing off the main road in front of the building. Protesters using crowbars also smashed up concrete barricades behind the sprawling complex. Authorities have deployed about 3,700 police officers and 1,680 soldiers for the protests but Abhisit insisted any crowd control would be peaceful. "My government has no policy to resort to violence. If we need to maintain rule of law, we will use legal measures," he said. In addition to calling for elections, the Red Shirts have demanded the sacking of Foreign Minister Kasit Piromya because of his links to the anti-Thaksin People's Alliance for Democracy (PAD) movement. Jatuporn said they planned to lead a splinter march to the Foreign Ministry on Wednesday to try to force Kasit out. The Red Shirts also want the return of the 1997 constitution, which was replaced by a new constitution following the 2006 coup that toppled Thaksin, and the speeding up of prosecutions against PAD leaders. Protest leaders have said they will not obstruct the Asean summit, which has already been postponed from December and then moved from Bangkok to Hua Hin because of ongoing unrest. The kingdom has endured months of political upheaval rooted in a deep divide between foes and supporters of Thaksin, who remains influential despite living in exile to avoid a jail sentence for corruption. Telecommunications tycoon Thaksin is loathed by elements of the old power cliques in the military, palace and bureaucracy who felt threatened by his immense popularity with the rural poor.