Russia has sent paratroopers into Kazakhstan to quell a countrywide uprising after deadly violence spread across the tightly controlled former Soviet state.
Police said they had killed dozens of rioters in the main city Almaty.
State television said 13 members of the security forces had also died, including two who had been decapitated.
Reuters journalists in Almaty said a presidential residence and the mayor’s office were both ablaze.
By Thursday afternoon, the city’s airport, seized earlier by protesters, was under the firm control of military personnel.
Burnt-out cars littered the streets.
Several armoured personnel carriers and scores of troops had entered the main square of Almaty on Thursday morning, and gunshots could be heard as troops approached the crowd, Reuters correspondents reported.
Later on Thursday, the square appeared peaceful, with 200 to 300 protesters still gathered and no troops around.
Internet had been shut down across the country and the full extent of the violence was impossible to confirm.
But the unrest was unprecedented for Kazakhstan, ruled firmly since Soviet times by leader Nursultan Nazarbayev, 81, who had held on to the reins despite stepping down three years ago as president.
Mr Nazarbayev’s hand-picked successor, President Kassym-Jomart Tokayev, called in forces from ally Russia overnight as part of a Moscow-led military alliance of ex-Soviet states.
He blamed the unrest on foreign-trained terrorists who he said had seized buildings and weapons.
“It is an undermining of the integrity of the state and most importantly it is an attack on our citizens who are asking me … to help them urgently,” he said.
The secretariat of the Russian-led Collective Security Treaty Organisation said troops being sent included units from Russia, Belarus, Armenia, Tajikistan and Kyrgyzstan. It did not disclose the overall size of the force.
Russian paratroopers were being transferred to Kazakhstan and “the advanced units of its contingent have already begun to fulfil their assigned tasks”.
Unverified video on social media showed troops patrolling Almaty’s foggy streets overnight, firing weapons, as well as widespread looting in the city.
The uprising, which began as protests against a New Year’s Day fuel price hike, had swelled dramatically on Wednesday, when the protesters stormed and torched public buildings.
They chanted slogans against Mr Nazarbayev, and in at least one case looped ropes around a bronze statue of him, trying to pull it down.
Mr Tokayev initially responded by dismissing his cabinet, reversing the fuel price rise and distancing himself from his predecessor.
He also announced he was taking over a powerful security post Mr Nazarbayev had retained.
But the actions appeared insufficient to mollify crowds who accuse the authorities of amassing huge wealth in oil and minerals while the nation of 19 million remained mostly poor.
Mr Nazarbayev stepped down in 2019 as the last Soviet-era Communist Party boss still ruling a former Soviet state.
But he and his family retained control, keeping key posts overseeing security forces and the political apparatus in Nur-Sultan, the purpose-built capital bearing his name.
TASS news agency quoted the Kazakh health ministry as saying more than 1000 people had been injured during the protests, and more than 400 were in hospital.
Mr Tokayev ordered government protection for foreign embassies and businesses owned by foreign companies.
The country’s reputation for stability had helped attract hundreds of billions of dollars of foreign investment in oil and metals industries.