Some 1,000 people were said to have been inside the Lanterna Azzurra (Blue Lantern) nightclub in the town of Madonna del Piano on the Adriatic coast.
Six people have been killed and more than 100 injured, 10 of them seriously, in a stampede at a nightclub in Italy, officials say. Numerous injured suffered severe bruising while others had broken bones.
Firefighters said there was panic when it is thought pepper spray may have been fired inside the club in the town of Corinaldo during a concert performance by the Italian rapper, Sfera Ebbasta.
Twelve of the 35 injured were in serious condition, Capocasa said.
The local fire brigade said someone might have sprayed a substance like pepper spray into the crowd, triggering a panicked rush to the emergency exits.
The ages of the victims weren't immediately given.
It was not immediately clear how many people were inside the club when the stampede erupted or what the venue's maximum capacity is.
The tragedy took place around 1:00am local time.
The "giving way of two parapets due to the crush of the young people getting out" probably caused the tragedy, Interior Minister Matteo Salvini told RAI.
A 16-year-old boy told Ansa that fans were dancing while waiting for the start of the show when the stampede erupted. According to Associated Press, one of the survivors said that some of the emergency exits were locked when the attendees tried to escape the building.
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