The owner of Expirat, Andrei Sosa, announced the permanent closure of his Bucharest club, which has only one exit door.
"I apologize and I take responsibility. From 2003 I have put the lives of thousands in danger. Weekend after weekend and sometimes during the week," he said.
In Iasi, a city in northeastern Romania, La Baza club apologized for not meeting minimum safety requirements. "We consider we have been ignorant and irresponsible. We were lucky. We don't want to put anyone's life in danger," it said on its Facebook page.
Fire engulfed Colectiv, a basement club, during a rock concert Friday night. Witnesses say a spark on stage from a heavy-metal pyrotechnics show ignited foam decor, sending panicked people rushing for the single exit.
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Some 180 people were injured, and 90 remain hospitalized in serious condition with authorities predicting the death toll could rise "significantly." The latest death was announced today evening.
Prime Minister Victor Ponta has called for authorities to check nightclubs and bars around the country to determine whether they meet safety standards. "It's awful that you let your children go in the evening to the club, and you go to look for them at the morgue," he said Saturday.
Today, Romanians arrived in their hundreds at the club, laying flowers and lighting candles for the victims, many of them young. As the nation went into its third day of mourning, schools in Bucharest instructed students to dress in black, and some teachers suspended classes and let pupils pay their respects at the club, which has become a shrine to the dead and the focus of the nation's grief.