Five teenage girls died when a fire broke out near an escape room in which they were playing Friday in northern Poland, local authorities said.
The girls were believed to be celebrating one of their birthdays, a police spokeswoman said.
A 26-year-old man employed at the location was hospitalised with burns.
Brudzinski ordered fire safety controls in all Polish "escape rooms", which are popular with teenagers across the nation.
Since Friday, over 200 of Poland's some 1,100 escape rooms have been checked, revealing a number of safety flaws that needed to be immediately fixed.
The "Escape Room" game has players locked inside a room or building and they must find clues that help them get out.
Al Jazeera has reported the Polish state news agency, PAP, said it had learned unofficially the girls died from carbon monoxide asphyxiation. According to initial findings, the fire brigade, the fire broke out in an adjoining room.
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He said firefighters who put out the blaze and other witnesses were being questioned.
Since the deaths of the children, there has been a public memorial held at Koszalin Cathedral and in front of the residence where the escape room was held. What caused the fire has not been determined.
"A devastating tragedy in Koszalin", Interior Minister Joachim Brudziński said on Twitter. The spokesperson for the Koszaliner police stressed, however, that one could say nothing to the causes of the fire.
Escape rooms have recently surged in popularity in Poland and across Europe and the world. Five joyous, growing up girls have been torn out of their lives.
A government official confirmed the five girls who died were all 15 years of age.
The deaths have prompted an outpouring of grief in Poland, with Prime Minister Mateusz Morawiecki issuing condolences to the victims' relatives and a day of mourning announced in the city of Koszalin.