Greek militants were on Thursday suspected of sending a letter bomb to the Paris offices of the International Monetary Fund which injured a female employee, a day after Germany's finance ministry intercepted an explosive package.

A secretary suffered injuries to her face and arms when opening the letter to the IMF's European representative in the IMF's Paris offices, officials said.

The explosion was caused by a device that was fairly home-made, "like a big fire cracker," said Paris police chief Michel Cadot.