Italy's Interior Minister Matteo Salvini has been criticised for a tweet that alleged that police had arrested 15 members of the "Nigerian mafia" in Turin.

Turin magistrate Armando Spataro reportedly said that Mr Salvini's message threatened to disrupt the ongoing operation in the city.

Moreover, not all those arrested have links to organised crime, and 15 was not the correct number of people arrested, he said in a statement.

The dawn raid in Palermo netted 80-year-old jeweller Settimo Mineo. He was reportedly elected Cosa Nostra godfather at a Mafia meeting in May.