Kiev, Ukraine (CNN) -- The mood around Independence Square in Ukraine's capital was very somber Sunday as thousands gathered, mourning the dozens of people killed in demonstrations during the past week and wondering who will take charge of the politically divided nation. They wondered where President Viktor Yanukovych, who reportedly tried to leave the country Saturday night, had gone. No one in the government appeared to know. There was a great uncertainty in the country after the rapidly moving events of the past 24 hours, which saw Parliament oust Yanukovych, free his political rival Yulia Tymoshenko from prison and schedule elections for May.
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NEW: U.S. asks Russia to accept changes in Ukraine, work to move country forward
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Yulia Tymoshenko, freed from prison, says no to future prime minister slot
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Government say it doesn't know where ousted President Viktor Yanukovych is
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Official from Yanukovych's party blames him for "robbery and deception"
@placeholder voted to oust the President and hold new elections on May 25.