Verona – According to media reports, three police officers were killed and another 13 security guards were injured in an explosion during a police operation in northern Italy. As the Italian news agency ANSA reported on Tuesday, other emergency services were injured in the incident in Castel D’Azzano, south of the city of Verona. Accordingly, the police were in the process of clearing a country house in which three people were when the detonation occurred.