The man is still in the courthouse, surrounded by police.
This has been reported by AP on Thursday. All the people in the courthouse have been evacuated.
TV channel Sky TG24 reports that the gunman is in a cabinet on the top floor of the building.
Local media report that the name of the gunman is Claudio Dzhiardello.
Police has surrounded the courthouse.
It is not yet clear how a man with weapon could get into the courthouse, since he had to go through metal detectors.Source: Associated Press