More than 2000 people staged Wednesday an anti-government protest in front of the Parliament in Sofia and brief clashes with police erupted.
Some of the windows of the parliament were reportedly broken by hooligans and police forces started to disperse protesters.
Earlier the municipality and the police had received a warning by a source that a group intends to place a bomb near the building.
After the call Sofia Mayor Boyko Borisov decided to ban the protest.
The rally was initially organized by students protesting against the socialist-led government policies and the deepening social and economic problems in Bulgaria.