Search for Greek ties over IMF letter bomb

French prosecutors are investigating a possible Greek link after a letter exploded at the Paris office of the International Monetary Fund, lightly injuring one person.

The IMF incident on Thursday came as a Greek anarchist group claimed responsibility for a letter bomb sent to the German finance ministry the day before.

The Paris prosecutor's office said investigators found "residues of Greek stamps" on the letter bomb at the IMF's office.

French President Francois Hollande called Thursday's explosion "an attack" and noted "a similarity with another event of the same nature in Berlin ... We are trying to establish the causes of what happened as part of an international investigation."

Authorities in Athens confirmed the Greek lead in the investigation.

"We've just been informed by the French authorities that (the parcel) was posted from Greece," Greek deputy minister for public order Nikos Toskas told Antenna TV.

Toskas added that whoever sent the Paris' letter bomb used the name of a senior Greek conservative opposition lawmaker, Vassilis Kikilias, and "the address of an office that is no longer in use".

The failed letter bomb sent on Wednesday also had the name of a false sender - another senior MP from the same party, Adonis Georgiadis.

It was unclear who sent the homemade explosive, which was like a "big firecracker" and sent by regular mail, Paris police chief Michel Cadot said.

IMF director Christine Lagarde, who is French, condemned "this cowardly act of violence".

The secretary who opened the letter was injured by shrapnel in the face and hurt in the eardrum because of a "rather violent noise", the police chief said.

A Greek public order ministry official told the Associated Press it looked as if both parcel bombs were the work of the same group.

"It is very likely that they were sent by the same organisation, although we can't be quite sure yet," he said.

"It looks as if it could be a repeat of 2010", when Conspiracy Cells of Fire sent explosive parcels to the offices of European politicians - including German Chancellor Angela Merkel - and embassies in Athens.

Authorities are concerned the group might have sent more parcels that had not yet been detected.

The Greek group that claimed responsibility for the German bombing, Conspiracy Cells of Fire, posted on a Greek left-wing website that the attack was part of a concerted campaign by international anarchist groups.

© AP 2017

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