An explosion has torn through a nightclub in the Russian city of Perm, killing at least 101 people.
Another 60 people were injured in the blast, the city's emergency services told the BBC.
Police say they are investigating whether the accident involved two large firework displays, as the nightclub was celebrating its eighth anniversary.
About 200 people were said to have been in the club, named as the Lame Horse, when the blast occurred at around 2000 GMT.
The emergency services say they believe most victims may have died from smoke inhalation.