
“One person, a 43-year-old employee was killed,” the prosecutor-general was quoted as saying by the Russian news agency RIA Novosti.
“37 others were injured, of whom four are in a serious condition,” the statement said.
RIA Novosti quoted medical sources as saying that an Italian and a Senegalese citizen were among the casualties.
The blast, which occurred at 3am, was caused by a leak from a tank of liquefied gas stored in the nightclub, according to the national gas utility, Azerigas.
A fire caused by the explosion has been extinguished and the search and rescue operation completed, the emergency situations ministry said.