Polish police said today that 22 officers were injured and 176 people arrested on Sunday during clashes at an independence day march.
The far-right rally was one of three separate processions through Warsaw on the day, which marks the date in 1918 when a unified Poland gained independence after more than a century of being split between the German, Austrian and Russian empires.
Two separate demonstrations by government supporters and by leftwingers passed without incident.
But the nationalist march erupted into violence when protesters - some of whom were masked - threw "stones, firecrackers and metal objects" at police, who hit back with tear-gas and rubber bullets.
President Bronislaw Komorowski attacked parliament for rejecting his bid to ban face coverings at public gatherings.