(VOVworld) - Italy’s Prime Minister, Matteo Renzi, criticized the Italian security system for mistakes and carelessness, after a defendant shot dead three people and wounded two others in a Milan courtroom. The shooting raised concerns about security at Italy's courthouses, where much of the surveillance has been outsourced to private contractors, and about Italy's ability to protect visitors during the Milan Expo 2015 world's fair, which opens May 1 and is expected to attract 20 million visitors over six months. At a government press briefing on Thursday, PM Renzi ordered an urgent security review across Italy and pledged a robust investigation into how the man gained entrance to the courthouse with a weapon.