Anti-capitalist demonstrators and police battled Wednesday outside the European Central Bank's new headquarters in Frankfurt, Germany. Police cars were set on fire and nearby streets were blockaded with burning tires while a ceremony got underway inside to inaugurate the $1 billion-plus building.

Reuters news agency says more than 90 police officers and about 100 demonstrators were injured in the protests organized by a group called Blockupy, a take-off on the Occupy Wall Street movement. At least 350 demonstrators were arrested.

Blockupy says more than 7,000 people showed up to voice concern about the bank's policies, such as implementing austerity measures for financially troubled Greece. Reuters reports that police believe the number of protesters was closer to 3,500.

The Guardian says police used water cannons to try to make a path through the protesters. Hundreds of other officers surrounded the bank. Inside, German Justice Minister Heiko Maas told officials gathered for the opening ceremony that "everyone has the right to criticise institutions like the ECB. But pure rioting goes beyond all limits in the battle for political opinion," according to the newspaper.

Blockupy says it represents "grassroots critics" of supranational financial institutions. The European Central Bank is in charge of managing the euro. The bank, along with the International Monetary Fund and the European Commission, sets conditions and monitors countries that have received bailout loans, such as Greece and Cyprus.

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