A militant anarchist group claimed responsibility on Monday for three bomb attacks in Athens during the last week, reports said.
In a statement posted online, Fire Conspiracy Cells said it was behind the explosions, which took place outside a police detention center, the home of the president of the Pakistani association in Athens and the offices of the far-right organisation Golden Dawn, dpa reported.
The attacks caused damage but no injuries.
The group also claimed responsibility for an explosion outside Parliament in January and a powerful blast outside the National Insurance building in December, which caused extensive damage to buildings and parked cars nearby.
Greece has suffered a series of bomb attacks carried out by leftist and anarchist groups which have targeted diplomatic missions, police stations, businesses and government buildings since the police shooting of a teenager triggered the country's worst riots in December 2008.