MOSCOW, March 23. /TASS/. Some 477 people were involved in the firefighting efforts in the Crocus City Hall music venue, a source in the press service of the Moscow Region’s Emergencies Ministry told TASS.

"A total of 477 people and 183 units of equipment are involved [in the firefighting efforts], including 192 people and 79 units of equipment from the Russian Emergencies Ministry," the press service said.

A terrorist attack was carried out at the Crocus City Hall music venue in the city of Krasnogorsk near Moscow on Friday evening. Unidentified gunmen armed with assault rifles went on a shooting spree. An explosion rocked the building, starting a fire. The special services are conducting a search operation. Moscow Mayor Sergey Sobyanin canceled all mass events in the capital in the next two days, and a number of other Russian regions followed suit.