A makeshift explosive device at a tax office in the southern Athens district of Neos Kosmos was neutralised by bomb disposal experts using a controlled explosion on Wednesday.
The bomb was found on the ground floor of the building in a rubbish bin after an unidentified caller placed a warning call to the newspaper "Eleftherotypia". The call came at 2:00 p.m., warning that an explosion would occur in the building in 25 minutes.
The building was evacuated and the area cordoned off while a team of bomb disposal experts located and then safely detonated the device, which proved to be a time bomb.
An investigation has been launched, while no organisation has so far claimed responsibility.