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The protesters say the police set the homeless or the ex-prisoners on them.
Street actions were held by the opposition forces of Ukraine on Sunday.
They also used firecrackers.
Thousands of people across Ukraine get to the streets angry at government's move to delay an association deal with the EU.
Ukraine's Victar Yanukovich is rumoured to have told Lithuania's Dalia Grybauskaitė why an association agreement with the EU could not be signed.
Kiev cannot sign an association agreement with the EU due to Russia’s economic pressure and blackmail.
They are planning to do it before the Eastern Partnership summit in Vilnius.
Residents of the Northern hemisphere can already see the brightest comet called Ison.
Six draft bills dedicated to this issue were considered on Thursday, none of them was adopted.
