The investigation is also looking into other sources of infection.

The investigation only looked at around ten politicians and no legal action was taken.

In general terms, those are the two areas that an investigation would be looking into.

Italian newspapers have reported in recent days that the investigation may soon look at local politicians.

It is also expected that the investigations will look at other universities.

He said his current investigation would look at all levels of the company from crew members to top officials.

"It is something that our investigation will look at."

Mr. Field said the investigation looked like the action of an eager prosecutor out to make a name for himself.

Experts said the federal investigation would look closely at all these possibilities, and perhaps others.

That investigation is looking into whether the companies provided incentives to physicians to use their products.