"Everyone is trying to identify the nationalities of the victims. There is one US citizen, one Moroccan national, there are also the English, and the Argentine," Valls said.
He noted that, ultimately, it was up to Lufthansa and Spanish and German authorities to provide data on the casualties of the plane crash.
Earlier media reports suggested that mostly German, Spanish and Turkish nationals were on board the aircraft.
The Airbus A320 of Lufthansa's Germanwings low-cost airline, en route from Barcelona to Dusseldorf, crashed in southern France on Tuesday. All 150 people on board died in the crash.
On Wednesday, Marseille Prosecutor General Brice Robin said that the first data from the plane's black box could be deciphered later in the day.