Riot police used tear gas and truncheons to disperse far-right activists in Warsaw as Poland marked its Independence Day. Two officers were reportedly injured in the clashes.

­Violence broke out as police attempted to disperse crowds of nationalist protesters in an attempt to prevent a confrontation with anti-fascist groups during Poland's National Day march in the country's capital.Right-wing extremists pelted officers with firecrackers and rocks as they tried to breach police cordons and reach a gathering of anti-fascist activists.Two officers were reportedly injured, and several rioters were detained.Riot police stand between demonstrators as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012. (Reuters / Agencja Gazeta) ­Thousands of officers were deployed to the streets of Warsaw earlier in the day to prevent the rival groups from confronting each other. Polish nationalists and radical left-wing groups often use National Day as a pretext to fight each other.Right-wingers advocate a religious and Slav-dominated Poland, conservative and immune to foreign influence. Leftist groups espouse various different anarchist and socialist ideologies, but are united by an opposition to white nationalism.Most of Sunday's 100,000-person National Day march was peaceful.Demonstrators are seen on the streets as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012. (Reuters / Agencja Gazeta)Demonstrators are seen on the streets as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012. (Reuters / Agencja Gazeta)Riot police detain a demonstrator as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012. (Reuters / Kacper Pempel)Riot police confronts demonstrators as violence breaks out a parade celebrating Poland's national holiday in Warsaw November 11, 2012. (Reuters / Kacper Pempel) ­Demonstrators taunt the riot police as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012. (Reuters / Peter Andrews) ­Riot police detain a demonstrator as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012.(Reuters / Peter Andrews) ­A demonstrator holds up a flag as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012.(Reuters / Peter Andrews) ­Riot police confronts demonstrators as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012.(Reuters / Peter Andrews)Riot police confront demonstrators as violence breaks out at a paradecelebrating Poland's national holiday in Warsaw November 11, 2012.(Reuters / Peter Andrews) ­A demonstrator holds flares up as he taunts the riot police as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012.(Reuters / Peter Andrews) ­A demonstrator holds a flag as violence breaks out at a parade celebrating Poland's national holiday in Warsaw November 11, 2012.(Reuters / Peter Andrews)