There are a few fires on Maidan.
Protesters earlier called on women and children to leave the scene immediately.
Batkivshchina opposition party leader Arseny Yatsenyuk has asked Ukrainian President Viktor Yanukovich for truce until morning.
Ukrainian news agency Unian reported citing the Interior Ministry that 8 people had been killed in clashes.
The Canadian embassy was attacked, a senior Ukrainian Interior Ministry investigator told Itar-Tass.
Seventy-one riot participants turned to Kiev medical institutions for help today, with 59 hospitalized.
Prime Minister Nikolai Azarov resigned on January 28, and the Ukrainian leadership also decided to pardon participants of riots on the condition protesters vacated state and local power institutions they seized within 15 days. The initial reaction of opposition leaders to the amnesty law that entered into force February 2 was defiant and skeptical.
A new wave of riots occurred in Kiev on Tuesday, and Svoboda opposition party leader Oleg Tyagnibok said it was caused by failure to agree on a constitutional reform cutting presidential powers.
Meanwhile, Kiev’s police reported Tuesday that the building of the city state administration had been seized again by protesters who threw Molotov cocktails. Earlier, protesters held the building for over 2.5 months, but vacated it on February 16 to observe the amnesty law adopted by the authorities.
Protesters had time until February 17 to vacate seized state and local power institutions, unblock Grushevskogo Street in downtown Kiev and other streets and squares across the country except those where peaceful protest rallies were being held.
The head of the Kiev city state administration, Vladimir Makeyenko, urged people to “abstain from visiting the city center” due to protests in an emergency television address to Kiev residents. He also called on politicians to avoid confrontation.
Motor traffic on roads in Kiev has been restricted.
The US ambassador in Kiev, Geoffrey Payatt, warned the Ukrainian conflicting sides that those who use violence may face US sanctions. German Foreign Minister Frank-Walter Steinmeier did not rule out sanctions either, saying Europe could “review its previous restraint.”
UN Secretary General Ban Ki-moon called on the Ukrainian conflicting sides to stop violence and resume dialogue aimed at working out a solution to the crisis as soon as possible.