Footage appearing to show the battle close-up between police and protesters on the streets of the Ukrainian capital Kiev has been posted on YouTube.
In the video, which was posted today but cannot be independently verified by ITV News, officers are seen hitting protesters with batons before demonstrators fight back in the violent clashes.
A warning that this video shows people being kicked and hit with batons.
Ukraine's interim President has expressed concerns about signs of separatism as opposition in Russian-speaking regions grows.
Hundreds of Ukrainians and journalists flocked to the presidential palace, as reports emerged that President Yanukovich had left the city.
Vitali Klitschko was met with boos from anti-government protesters, as he attempted to convince them a peace deal is best course of action.