**An explosion has torn through a nightclub in the Russian city of Perm, killing at least 15 people, media reports say.**Details are sketchy but Russian news agencies citing police report that 60 people were also injured in the blast.
The blast happened at 2315 local time (2015 GMT), RIA news agency said.
Itar-Tass news agency said the blast was thought to be caused by fireworks. Perm is some 1,400km (870 miles) east of Moscow.
The RIA Novosti news agency quoted an official from the emergencies ministry as saying there appeared to be no blaze following the explosion.