Milan prosecutors had the right to hold Mr. Tanzi, who was arrested in the end of December, for three months.

The Milan prosecutors decided against seeking fast-track indictments for six other banks that are under investigation.

Mr. Sala, a former bank employee, is considered by the Milan prosecutors to be one of the masterminds of Parmalat's fraud.

Now Milan prosecutors, who are working with Mr. Volcker's investigators, suspect that some of the graft can be traced to Lombardy.

Interrogated by the Milan prosecutor in July 2006, General Pollari involved the Italian government and invoked a classified document.

Some ENAV employees are under investigation by Milan prosecutors looking into the October crash.

A statement issued by a Milan prosecutor identified the man as Bachir Khodr and said he was carrying a Lebanese passport.

It has been more than four years since a team of Milan prosecutors opened the corruption investigation that led to the collapse of Italy's ruling political class.

The Milan prosecutors jailed more than 10 people as part of their investigation, all of whom have since been released or placed under house arrest.

The Milan prosecutor leading the investigation, however, pledged to resubmit the extradition request once Italy's new government is in place.