The Interior Ministry said several other people were suffering from shock.
"Someone came to the office and left a package. The secretary that opened it in fact opened a parcel bomb. The parcel bomb killed her," said senior Paris lawyer Christian Charriere-Bournazel.
Paris Mayor Bertrand Delanoe said the building targeted - in the 8th district of the French capital - also houses a foundation that does research on the Holocaust. But the mayor stressed that he knew of no link between that fact and the attack.
The building also houses a law firm that Nicolas Sarkozy, now the French president, used to work with.
Russia has developed an unmanned submarine capable of carrying a powerful nuclear munition. Two years ago, the Americans could not even think Russia could do it
The head of the Russian Finance Ministry, Anton Siluanov, said that the Americans would suffer additional losses if they impose sanctions on Russia's public debt