Open warfare broke out on the streets of Kyiv today, with at least four persons reportedly killed and more than 100 people injured.The death toll is likely to increase, as opposition leader Yuriy Lutsenko reported that he has seen at least 10 corpses today. There was no official confirmation of his estimate, however.Dr. Olga Bogomolets, a physician, told the Kyiv Post at 3:30 p.m. today that three protesters had been shot to death while dozens more were injured, including many with serious wounds.The Emergencies Ministry reported a fourth casualty, that of an employee for the ruling pro-presidential Party of Regions, apparently killed after protesters stormed the party office on Lypska Street.Oleh Musiy, the medical director for the anti-government protesters, said at 4:45 p.m. that the three dead victims would be identified soon. He said that one victim died from a gunshot wound to the head while two others died from head injuries.The three slain protesters were taken to the House of Officers on Hrushevskoho Street. One man is tentatively identified as Serhiy Didych, a member of a local city council in western Ukraine's Ivano-Frankivsk Oblast. Another is identified as Volodymyr Yuriyovych Kishuk of Zaporyzhia in southeastern Ukraine. The third fatal victim had not ben identified as of 5:30 pm. The four deaths came amid renewed violent clashes that pit thousands of police and protesters against each other at several locations near Ukraine's parliament building in Kyiv. When added to the five protesters killed in January, the death toll in the anti-government EuroMaidan protests that began on Nov. 21 has now reached nine persons.Police said today that at least 37 police officers were injured, but that number could not be confirmed by other sources. The Institute of Mass Information also said that at least 15 journalists covering the violence were attacked by police.