 Authorities of Greece are investigating a minor explosion that occurred outside a bank near the Ministry of Labor and Social Affairs in Central Athens as early February 3. Reports suggest police received multiple anonymous calls warning of an explosive device at the location. Officers managed to secure and cordon off the area before the bomb exploded at around 130. According to local reports, a suspected leftist revolutionary class self-defense group had claimed responsibility for the incident, though their motive is not immediately clear. The blast caused minor damage, and there were no reports of casualties. Police have launched an investigation into the incident. Greece has a history of political violence. Small bomb and arson attacks are frequent and most of them do not cause serious damage. However, the government said it was worried by the incident. The attack is very serious and has to do with a serious crime, government spokesman Pavlos Maranakis told OpenTV Broadcaster.