Five teenage girls have died and one man was seriously injured after a fire broke out at an “escape room” interactive game location, in the northern Polish city of Koszalin, officials said, The Guardian reported

“The victims of this tragedy are 15-year-old children, girls celebrating a birthday,” interior minister Joachim Brudziński told broadcaster TVN24.

Fire spokesman Tomasz Kubiak confirmed that the dead were women, and told AFP that “one man with severe burns was taken to an intensive care unit.”

Local police press officer Monika Kosiec told reporters that the injured man is thought to be 25 years old.

Police and fire officials said they did not yet know what started the blaze in the escape room.

Brudziński directed the state fire service to carry out fire security controls in every escape room across the country, of which there are more than 1,000.

Escape rooms are popular around the world and offer a live-action experience in which players are locked in a room with one hour to figure out a series of clues and riddles to get out.