"The area of the collapsed cafe on Youth Boulevard is about 240 square meters. Under the debris may be up to 10 people", a source in the Russian Emergencies Ministry said early on Sunday.
According to Russian-based media reports, at least four persons were found alive under the rubble. One of the survivors remains in critical condition. Russian emergency teams continue to dismantle the collapsed structure while searching for additional survivors.
Another source cited by local media said that a dressing room constructed as an extension to the main building collapsed. Dozens of rescuers have been dispatched to the scene while local authorities have launched an investigation into the incident.
The name of the venue and the cause of the incident reportedly remain unknown. According to officials, no fire has been reported.