Police in Germany have temporarily detained some 400 demonstrators during largely peaceful protests by Occupy activists.
Frankfurt police said up to 1,000 people turned out at some of the unauthorized protest rallies scattered across the city Friday. They say protesters erected barricades, staged sit-ins and tore down traffic signs.
The protest group calling itself Blockupy seeks to stage protests over the weekend and has called for barring access to the European Central Bank, which is located in the downtown business district of continental Europe's biggest financial hub.
Some 5,000 police officers are to keep the weekend protests in check.
An Occupy tent camp in front of the ECB was cleared Wednesday as part of the security measures for the weekend protests. Authorities say the camp can be re-erected late Sunday.