It was identified by police as businessman Claudio Giardiello, 45 old. He owns a real estate agency in central Milan. The killer was later caught in Vimercate, a town near Milan where he had gone to try to kill another person. People on trial and visitors to the courthouse are required to pass through a metal detector but lawyers and court officials are normally allowed to enter without being checked. It’s not clear how Giardiello got the gun. Italy’s Prime Minister Matteo Renzi promised a speedy investigation into how the shooter managed to get by security with the gun. Another strange fact: Giardiello managed also to leave the courthouse 45 minutes after he had fired his first shots and while the building was being locked down. Shooter was arrested and is now being held in police station.