According to new reports, the Kiev offices of Ukrainian President Viktor Yanukovych are unguarded, with opposition protesters apparently in full control of the government district.
Ukraine’s capital is now quiet, a day after deal was signed to end a political crisis in which dozens have died.
As parliament met on Saturday, the speaker, Volodymyr Rybak stood down.
Volodymyr Rybak cited ill health as the reason for his resignation.
Despite the deal signed on Friday, thousands of people have remained on the streets of Kiev.
There is no sign of security forces inside the previously heavily guarded presidential complex, though some government employees arrived for work.
There are unconfirmed reports that President Viktor Yanukovych has left Kiev, with suggestions that he has travelled to Kharkiv in the east, close to the Russian border.
One group of far-right protesters had threatened to take action if he did not resign by Saturday morning.
Meanwhile, the opposition Udar party, led by Vitaly Klitschko, is to submit a resolution to parliament demanding Viktor Yanukovych’s immediate resignation.
Spokeswoman Oksana Zinoviyeva told Reuters the move would allow parliament to set a date for early elections.
On Thursday, police opened fire on protesters who have been occupying Independence Square in central Kiev. The health ministry said 77 people – both protesters and police – had been killed since Tuesday in the worst violence since protests began in November.
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