Police on Friday seized documents from recently rescued Banca Etruria in connection with the suicide of one of its bondholders, Luigi D'Angelo.
Prosecutors said they would be questioning bank officials.
D'Angelo hanged himself November 28 after losing his life savings. Banca Etruria is one of four crisis-hit small lenders rescued on November 22, hitting shareholders and bondholders.
The government is putting together a 'humanitarian' package for the worst-hit of them.
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