President Rosen Plevneliev appealed for restraint after the overnight clashes in Sofia that left at least 20 people injured on the 40th straight day of anti-government protests in the small Balkan nation.
Violence erupted late yesterday when riot police tried to evacuate some of the 109 ministers, MPs, journalists and others besieged inside the legislature for over seven hours by 2,000 protesters camped outside shouting "Mafia!" and "Resign!"
Protests have been held in Sofia every evening since June 14 by thousands of people fed up with poverty and corruption who are calling for the resignation of the new government -- which took office less than two months ago.
But Plevneliev, who has been a staunch backer of the protests, urged both demonstrators and police to exercise restraint.
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"Last night we witnessed scenes that are incompatible with a democratic protest -- blockaded parliament, barricades in downtown Sofia, ruined streets and sidewalks," he said in a special address. "There is no aim that justifies violence."
Plevneliev's powers are limited but he would be responsible for appointing a caretaker administration and calling new elections should the beleaguered minority government of non-partisan Prime Minister Plamen Oresharski throw in the towel.
The stern technocrat has so far resisted demands to resign and call yet another round of elections, saying it would exacerbate the crisis and further damage the fragile economy.
Eighteen people, including five police officers, were hospitalised after yesterday's clashes, hospital sources said, while others were treated at the scene.
Demonstrators had hurled stones and water bottles at a bus trying to evacuate the besieged lawmakers, smashing several windows and forcing it to turn back, an AFP reporter said.