Italy's infrastructure minister resigned Friday, days after the arrest of a former top official in a corruption probe of some of the nation's major public works projects, AP reported.
Minister Maurizio Lupi told Parliament he was stepping down even though he is not under investigation. He denies any wrongdoing. No replacement for Lupi was immediately named.
Four people, including the ex-ministry official who oversaw infrastructure projects under seven governments, have been arrested.
Prosecutors are investigating construction contracts involving some of Italy's most ambitious projects, including stretches of a high-speed train line, the Italian pavilion for the world's fair that opens soon in Milan and Rome's subway expansion.