Fragments of Greek stamps were found at the Paris offices of the International Monetary Fund (IMF) where the letter bomb exploded, leaving the secretary with injuries to her face and hands.
A far-left Greek group called Conspiracy of Fire Nuclei is "likely behind" the Paris attack, a Greek police source told AFP in Athens.
French investigators have told their Greek counterparts that the package was sent from Athens, the official said.
The Conspiracy of Fire group had earlier claimed responsibility for an explosive device, also sent from Greece, that was discovered by police at the offices of German Finance Minister Wolfgang Schaeuble.
The package was discovered yesterday, a day before Schaeuble was due to host his new US counterpart, Steven Mnuchin.
Many Greeks blame Germany and the IMF for imposing years of public sector cuts and reforms in exchange for bailout packages needed to prop up the debt-ridden country.
The incidents occurred more than six years after Conspiracy of Fire waged a similar campaign targeting European officials.
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