Five teenage girls have died after a fire broke out while they were playing an escape game in Poland.
The cause of the fire is not yet known, but officials are carrying out safety checks on every escape room in Poland.
The five girls who died, all 15, were celebrating a friend's birthday when they visited the attraction.
Escape rooms, in which participants are locked in a room and must solve a series of puzzles in order to get out, are popular around the world.
The industry has grown rapidly in recent years. In the UK, the number of escape rooms has soared from just seven in 2013 to more than 1,000 as of last year.
Polish President Andrzej Duda said the fire was an "appalling tragedy".
"Five joyful girls starting out in life have had life torn away from them," he wrote on Twitter. "May God protect their parents and loved ones."
Interior Minister Joachim Brudzinski also shared his condolences.
"I want to express my sympathy and regrets to the families of the victims of the fire," he said in a tweet.
"I've instructed the chief commander of the State Fire Brigade to carry out fire checks on all places of this type across the country," he added.
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