Police and opposition representatives said many of the dead were killed by gunshots and that hundreds more were injured, with dozens in serious condition.
Ukrainian opposition leader Vitali Klitschko urged the pro-Western demonstrators occupying Kyiv's Independence Square - also known as Maidan - to defend their positions. He warned women and children to leave the area.
Later, Klitschko met with President Viktor Yanukovych for talks, but the meeting failed to produce a breakthrough. Klitschko said the president demanded protesters "stop the standoff" and unconditionally clear the square.
He told the Ukrainska Pravda website that he brings "nothing good from the talks."
Yanukovych's advisers told reporters the president will address the nation after meeting with the opposition on Wednesday. The exact time for the address has not been announced.
U.S. Vice President Joe Biden phoned Yanukovych late Tuesday to express "grave concern" about the violence, calling on the Ukrainian president to pull back security forces and to exercise maximum restraint.
Biden told Yanukovych his government bears "special responsibility" to resolve the crisis.
Anti-government protests have been building for weeks, with activists calling for Yanukovych's ouster after he backed away from a trade deal with the European Union in favor of closer ties with Russia.
Protesters, some armed with clubs and wearing helmets and body armor, attempted to stand their ground in central Kyiv, hurling firebombs and stones at police as plumes of smoke billowed from burning tents and piles of tires and wood.
Security forces have been steadily gaining ground in the square, where thousands of protesters still remained, hearing speeches from their leaders and singing the national anthem.
Resource:http://www.voanews.com
