For its part, the White House said
it was "outraged by the images of Ukrainian security forces firing
automatic weapons on their own people" and said the crisis "should be
resolved by political means".
At least 21 protesters have been killed by security forces in Kiev following the breakdown of a truce agreed on Wednesday.
Witnesses have told the BBC that some died as a result of single gunshot wounds, typical of sniper fire.Officials said that one policeman had died and that 67 police had been captured by protesters.Meanwhile, three European Union foreign ministers have held five hours of talks with President Viktor Yanukovych.Eyewitnesses have told international news agencies that they have counted between 21 and 27 protesters' bodies after clashes in Kiev.
Video footage has emerged apparently showing snipers firing on demonstrators who had been trying to retake their protest camp in Independence Square.
The Kiev city administration said 67 people had now died in clashes since Tuesday.
Officials said more than 20 policemen had also been injured.
Read more from http://www.bbc.co.uk/news/world-europe-26268620