President Barack Obama’s visit to Greece on Tuesday was met by angry protesters held back by riot police firing tear gas. About 7,000 people marched through central Athens while Obama attended a banquet at the presidential mansion just a few miles away. Hooded protesters and members of the Communist Party held up signs reading “We don’t need protectors,” “Yankees go home” and “Unwanted,” while some demonstrators tried to break through police cordons to get to the U.S. embassy. The protest saw violent clashes, with some demonstrators throwing petrol bombs at police. While Obama met with Greek leaders to express support for the debt-stricken country, the protesters appeared to be angry about the timing of the visit. Obama, the first U.S. president to visit Athens since Bill Clinton in 1999, was in town just two days before the anniversary of a 1973 revolt that helped oust a military junta backed by the U.S.