At least 37 people are confirmed to have died in a fire that tore through a shopping centre in the Siberian coal-mining city of Kemerovo.
At least 64 people are missing, including 41 children, and parts of the building are in danger of collapse.
The blaze started on an upper floor of the Winter Cherry complex while many of the victims were in cinema halls.
Video posted on social media showed people jumping from windows to escape the flames on Sunday.
As many as 660 emergency personnel have been deployed in the rescue effort.
The cause of the blaze is not yet known but authorities have launched an investigation.
Kemerovo, a key coal-producing area, lies about 3,600km (2,200 miles) east of Moscow.
Austrian Chancellor Sebastian Kurz has offered his condolences to the families and friends of the victims, as did Latvian Foreign Minister Edgars Rinkēvičs.