Three girls, two boys and a mother who had accompanied her child to the event died in the crush. Police said the teenagers were aged between 14 and 16, while the dead woman was 39.
Deputy Prime Minister Matteo Salvini, who also serves as interior minister, said there were many more people than permitted inside the club, where popular Italian rapper Sfera Ebbasta had been due to perform.
"The main hall had a capacity of 469 and they sold 1,300 tickets," a sombre Salvini told reporters after visiting the site. "You can't die at 14 in this way. You don't need new laws here. You need to have a conscience and respect existing laws."
Italian Prime Minister Giuseppe Conte told reporters that it appeared that only one of the nightclub's three halls had been open at the time. "The numbers are all wrong," he said.
Magistrates have opened an investigation into the deaths and there was no immediate comment from the nightclub's owners. (Reporting by Philip Pullella and Crispian Balmer; Editing by Alexander Smith and Gareth Jones)
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)