At least 13 people died after a fire broke out in a busy nightclub in the Russian city of Kostroma, officials said on Saturday. The fire took place in the early hours of the morning at Polygon, a multi-purpose recreation venue used as a cafe, nightclub and bar. 

Rescuers said 250 people were evacuated from the building. State media cited investigators as saying the fire started after a man fired a flare gun indoors, setting the ceiling alight. Police have now detained a man in connection with the incident, the interior ministry said.