People protesting the results of a parliamentary election in Kyrgyzstan broke into government and security headquarters early Tuesday and freed a former president from custody, local news websites said.
Authorities said they did not rule out holding another vote as public rallies started in other cities across the country.
The thousands-strong protests broke out after two establishment parties, one of which is close to President Sooronbai Jeenbekov, swept Sunday's vote, according to preliminary results.
Protesters demanded that the vote results be canceled and the Central Election Commission said on Tuesday it would consider their request, local news website 24.kg reported.
Russian news agency RIA quoted Jeenbekov's spokeswoman as saying he also did not rule out annulling the results of the contested election. The spokeswoman said Jeenbekov remained in control and was still in Bishkek.
Police had dispersed the protest late Monday, but protesters returned to the central square of the capital Bishkek hours later and broke into the building that houses both the president and parliament, the local websites said.
The building known locally as the White House briefly caught fire on Tuesday morning, but the blaze was quickly put out.
Protesters then broke into the headquarters of State Committee on National Security and freed former president Almazbek Atambayev, who was sentenced to a lengthy prison term this year on corruption charges after falling out with Jeenbekov, his successor.
Opposition groups took over several more buildings, including the mayor's office, and appointed their own acting head of national security, acting prosecutor general and a commandant of Bishkek although it was unclear how much actual power they wielded.
Several provincial governors have resigned, according to local media reports.
One person has been killed and 590 wounded in the overnight clashes, the government said.
Local media reported that public rallies began on Tuesday in several provincial centers, most of them anti-government, while Jeenbekov's supporters gathered in the southern city of Osh, where his brother called for unity and order.
The Central Asian country of 6.5 million, which is closely allied with Russia, has a history of political volatility. In the past 15 years, two of its presidents have been toppled by revolts.