A device exploded outside the offices of a shipping company in Kastella in central Piraeus in the early hours of Wednesday. The blast smashed windows and caused extensive damage to the building.
Police said the device went off at 3:05 a.m.
The explosion was so powerful that pieces of the bob were found 5-6 meters away, state broadcaster ERT reported.
There was no warning call and no one has so far claimed responsibility for the blast.
Nobody was injured.
Police has launched investigation.
