A protester throws a stone toward a burning police bus in front of him, during clashes with police, in central Kiev, Ukraine, on Sunday, Jan. 19, 2014. Hundreds of protesters on Sunday clashed with riot police in the center of the Ukrainian capital, after the passage of harsh anti-protest legislation last week seen as part of attempts to quash anti-government demonstrations.
Pro-European integration protesters attack a police van during a rally near government administration buildings in Kiev, on Jan. 19.
Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko, center, is attacked and sprayed with a fire extinguisher as he tries to stop the clashes in Kiev, on Jan. 19. A group of radical activists began attacking riot police with sticks, trying to push their way toward the Ukrainian parliament building, which has been cordoned off by rows of police and buses.
Radical protesters use a dry chemical fire extinguisher against opposition leader Vitali Klitschko, right, during a protest in Kiev, on Jan. 19.
A protester runs during clashes with police, in central Kiev, on Jan. 19.
A pro-European integration protester injured during clashes with Ukranian riot police receives treatment in Kiev, on Jan. 19. Protesters attacked riot police with sticks in Kiev on Sunday and tried to overturn a bus blocking their path to parliament, as up to 100,000 Ukrainians massed in defiance of sweeping new laws aimed at stamping out anti-government demonstrations.