Greek police destroyed a makeshift bomb outside the headquarters of a construction company in southern Athens following an anonymous phone call.
"An anonymous caller phoned a newspaper giving a 15-minute deadline for the bomb to explode," a police official said. "He did not say who had placed the bomb or why."
Bomb squads cordoned off the area around the company building in the Kalamaki neighbourhood and proceeded with a controlled explosion after the deadline passed without any blast.
The official said there were no damages or injuries and the yet unknown explosive device was of minor strength.
The construction firm, Olympiaki Techniki, was at the centre of a political storm earlier this year when several then ruling socialist deputies were accused of attempting to pass legislation that would favour the company.