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No ransom demand was made, but Mr Roveraro, 70, contacted his family saying he needed a million euros.Mr Roveraro had previously been questioned by police over the collapse of Italian food giant Parmalat, which he advised in the 1990s.
Mr Roveraro had not been seen since attending a meeting of the Catholic conservative group Opus Dei in Milan on 5 July.
He did contact his family on two later occasions. First he told his wife that he needed to visit to Austria to resolve an unspecified problem.
In his second call Mr Roveraro said he needed one million euros in cash wired to him immediately.