A makeshift bomb exploded outside an appeals court in Athens causing minor damage, police officials said.
There were no reports of injuries.
Two Greek media organisations received warning calls before the Thursday's explosion at 0250 (0050 GMT), Reuters news agency reported, citing police sources.
Police, who had cordoned off the area, found a bag which contained the explosive material outside the building.
They were investigating footage from cameras nearby, another official said.
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