PARIS • Investigators suspect a Greek anarchist group was behind a letter bomb that injured an IMF secretary in Paris, the day after an explosive device was found in Berlin, sources close to the probe said.

Fragments of Greek stamps were found at the Paris offices of the International Monetary Fund (IMF) where the letter bomb exploded on Thursday, 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 Agence France- Presse in Athens.

French investigators have told their Greek counterparts that the package was sent from Athens, the official said.

Separately, a source close to the French probe said it was focusing on "an anarchist group".

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 on Wednesday.

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 the group, which is blacklisted as a terror organisation by Washington, waged a similar campaign targeting European officials.

AGENCE FRANCE-PRESSE