Dozens of people have been hurt and some 350 people arrested as anti-austerity demonstrators clashed with police in the German city of Frankfurt.
Police cars were set alight and stones were thrown in a protest against the opening of a new base for the European Central Bank (ECB).
Violence broke out close to the city’s Alte Oper concert hall hours before the ECB building’s official opening.
“Blockupy” activists are expected to attend a rally later on Wednesday.
In earlier disturbances, police in riot gear used water cannon to clear hundreds of anti-capitalist protesters from the streets around the ne