He said investigators were still examining Vantaggiato 's motive for the attack , which appeared to be personal , since his explanation was n't convincing . Police say that Vantaggiato confessed to the attack while under questioning . The bomb killed a teenage girl and injured two other people . The device exploded as students arrived for classes at the university in Brindisi .
Police say that Vantaggiato confessed to the attack while under questioning . The bomb killed a teenage girl and injured two other people . The device exploded as students arrived for classes at the university in Brindisi .