The Thai government has warned protesters to leave the streets or face tough measures. Troops have been mobilised after demonstrators attacked official buildings in response to the prime minister’s announcement of a state of emergency.Tensions escalated rapidly over the weekend. The latest trouble erupted after Prime Minister Abhisit Vejjajiva vowed to take swift action against protesters who forced a summit of Asian leaders to be cancelled on Saturday. The demonstrators — supporters of Thaksin Shinawatra who was ousted as prime minister in 2006 — forced their way into the interior ministry and turned their fury on ministers’ cars. A senior official has called on the security forces to “fully and forcefully carry out their jobs.” The military has previously been reluctant to intervene in the political unrest that regularly affects Thailand.