Riot policemen stand guard while a construction vehicle demolishes a house to make way for a U.S. base extension in Pyongtaek, about 70 km (44 miles) south of Seoul September 13, 2006. South Korea's Defense Ministry begun demolishing empty houses to make way for the extension of the U.S. base site in the township. REUTERS/Kim Kyung-Hoon (SOUTH KOREA)