Liguria Governor Giovanni Toti was put under house arrest on Tuesday in relation to a probe by finance police and the Genoa DDA anti-mafia directorate.
The centre-right regional president is accused of corruption, sources said.
The case regards alleged bribes to obtain favours, such as concessions at the Port of Genoa's Rinfuse terminal.
Port logistics entrepreneur Aldo Spinelli was also put under house arrest while Paolo Emilio Signorini, the CEO of energy group Iren and the former chairman of the Western Ligurian Sea Port Authority, was arrested at taken to prison.
Francesco Moncada, a member of the board of the Esselunga supermarket chain., is under investigation too.
Moncada has also been suspended from exercising entrepreneurial and professional activities, as has Spinelli's Roberto Spinelli and Mauro Vianello, an entrepreneur operating in the Port of Genoa.
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