Three girls, two boys and a mother who had accompanied her child to the event, died in the incident. More than 100 other people were injured, including a dozen who were seriously hurt.
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.
La Repubblica newspaper quoted a survivor as saying that at least one of the exits was blocked. Another eyewitness said a wall inside the club had collapsed in the melee.
The names and ages of the victims were not immediately given. (Reporting By Philip Pullella and Crispian Balmer; Editing by Simon Cameron-Moore and Alexander Smith)
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