At least two police cars were set ablaze on Wednesday amid anti-austerity protests outside the new European Central Bank headquarters in Frankfurt, Germany. Police said at least one officer was injured from stones thrown by demonstrators who were trying to block the inauguration ceremony for the $1.4 billion building. Rioters reportedly lit cars and garbage cans on fire while setting off smoke bombs and throwing glass and corrosive substances, according to police. Demonstrators said police began using tear gas. Some 10,000 protesters were expected to join the Blockupy movement while police prepared for the protests with barricades and barbed wire around the ECB headquarters.