Police say several people were injured as nationalists clashed with Muslims during Friday prayer at Sofia's main mosque.
Dozens of supporters of the far-right Ataka party staged the rally to protest what they call "the unbearable loudness" of the Muslim prayers that sound through loudspeakers in downtown Sofia.
Tensions escalated as protesters grabbed a prayer rug and set it on fire, leading to a fight between the two groups.
Four people were taken to the hospital with light injuries, the state news agency BTA reported. Ataka says one of its lawmakers was hit on the head by a stone.
Police say five officers were injured two protesters have been detained.
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