Paris International Monetary Fund explosion: Christine Lagarde condemns 'cowardly act of violence' against staff
One injured in blast after envelope opened
One person has been injured in Paris in a small explosion after opening an envelope at the offices of the International Monetary Fund, French media is reporting.
IMF director Christine Lagarde condemned the "cowardly act of violence" against her staff.
Police in Paris say an operation is ongoing and early indications suggest it was a homemade device which probably caused it. Earlier it had been reported that a firework was behind the blast.
The IMF Europe Office in the French capital is based on Avenue d'lena, close to the Champs Elysees.
Staff from the IMF office were evacuated and armed military officers and police guarded the area, in a chic district of western Paris.
The World Bank office in France is in the same compound.
French media reported that the person had opened an envelope containing an explosive substance.
Reuters reported the person involved has been "slightly injured".
A spokesperson for the Paris prefecture of police said: "An operation is underway for a person injured by a suspicious package with, according to preliminary information, a firework inside."
Officials have said no other damage has been caused.
The incident comes a day after an explosive package was found at the offices of Germany's finance minister.
It is too early to say if both incidents are related.