Unconfirmed reports in Kyrgyzstan say the government has resigned and the president has fled the capital.
Amid violent anti-government demonstrations, the Russian new agency RIA quotes the opposition as saying the government has fallen, but there is no official confirmation.
Troops opened fire on thousands of protesters who smashed through the perimeter fence of state buildings.
The opposition claims at least 100 people have been killed in clashes, but that figure has not yet been independently verified.
Demonstrators calling on the resignation of President Kurmanbek Bakiyev stormed the prosecutor-general’s office and set the building on fire.
They also took control of the state television channel.
Bakiyev has come in for growing criticism in recent months over economic hardship and state corruption.