A gunman opened fire at a social security office and a courthouse in central Athens, wounding several people, Greek authorities said on Tuesday.
Police have launched an operation to locate the shooter, who Greek media reports say is 89 years old.
Police said the suspect, who was armed with a shotgun, first opened fire at a social security office in central Athens, wounding an employee.
Police officers, arriving at the scene, treated the employee, but the shooter had fled.
The gunman then opened fire on the ground floor of a city courthouse, wounding several more people.
Police said that the shotgun was found at the scene.
Motive for shooting remains unclear
The motive for the shooting remains unclear. The shooter reportedly threw envelopes containing documents on the floor after the shooting in the courthouse, claiming that this was the reason for his actions.
Gun violence is relatively rare in Greece, where the possession of firearms is permitted but strictly controlled.