An explosion at Greece's Economy Ministry in central Athens today caused some damage but no casualties.
The ministry is above a post office in the city's main Syntagma Square, about 100 metres from the parliament building. Both were closed at the time of the blast.
The explosion damaged shop fronts, cars and cafes and shattered windows in the business district of the city shortly before the morning rush hour.
Police said the bomb was believed to have been left on a motorcycle parked close to the building. It was not immediately clear who was behind the blast.
Police said there were two warning calls to a Greek newspaper about half an hour before the explosion, saying a bomb had been placed near the Economy Ministry.
It was the second bomb attack at a government building in six months. In June a guerrilla group calling itself "Revolutionary Struggle" bombed the Labour Ministry in the heart of the capital, causing no injuries but seriously damaging the building.
Police consider this a more powerful bomb than those used during minor attacks by fringe groups in recent years. But officials did not say whether the explosion was being linked to the appeals trial of 15 members of Greece's once-feared November 17 radical leftist guerrilla group.
Several fringe groups in recent weeks had warned of attacks during the trial.