Police in Frankfurt were preparing for as many as 30,000 protesters to join in the so-called "Blockupy" demonstration underway in Germany’s financial capital.

Various socialist and anti-capitalist groups have called for a four-day protest, extending through Sunday during a holiday weekend, against austerity measures enacted by governments across Europe.

The targets of their anger include the European Central Bank, the International Monetary Fund and large banks.

Yesterday, police removed about 340 protesters from their camp across the street from the ECB’s headquarters. There were 13 arrests.

Many businesses in the area have said they will stay closed during the protest.

With files from The Associated Press