Defying a ban, they want to ‘Blockupy’ Frankfurt.
That is the name anti-capitalist demonstrators have given to a four-day protest in Germany’s financial capital against Europe’s austerity policies.
Since Wednesday, they have been gathering in the city.
Police are out in force with the European Central Bank headquarters a key target of activists’ anger. Some 5,000 officers are ready to be deployed.
Around 150 people were detained on Thursday.
So far there have been no serious clashes. However police are bracing for Saturday’s authorised march which is expected to see up to 40,000 demonstrators descend on the city.