Anti-government demonstrators entered Thailand's finance ministry Monday, an AFP reporter said, as protest leaders threatened to occupy more government buildings in a bid to topple Prime Minister Yingluck Shinawatra's government. "Tomorrow (Tuesday) we will seize all ministries to show to the Thaksin system that they have no legitimacy to run the country," protest leader Suthep Thaugsuban said, referring to Yingluck's brother, ousted premier Thaksin Shinawatra, who lives in self-imposed exile.