Brindisi, June 18 - A man who confessed to the May 19, 2012 bombing at a Brindisi school that killed a 16-year-old girl and injured nine others was found guilty and sentenced to life in prison, a court in the city said. Giovanni Vantaggiato was found responsible for the bombing that killed Melissa Bassi at the trade institute named after the assassinated wife of anti-Mafia magistrate Giovanni Falcone. Anti-mafia investigators were involved in the case due to fears it might have involved domestic terrorism or organised crime. Vantiaggiato, a 69-year-old businessman, has given no plausible motive for his actions and insisted that he acted alone. The bombing at the school came close to the 20th anniversary of a mafia bombing that killed Falcone and his wife near Palermo. Shortly after the school bombing, Vantiaggiato led investigators to three other bombs with remote triggers that he had hidden off a country road outside the city of Lecce.