Police said the protests, attended mostly by leftist parties and trade unionists, were peaceful. Three demonstrators were detained.

"We will not allow the NPD to misuse this place with its disgusting ideology," said Green Party chairwoman Claudia Roth, standing in front of the town hall.

Further protests are expected after a regional administrative court ruled on Friday that the City of Berlin could not block the neo-Nazi group from holding its party convention in the Reinickendorf town hall.