Rescuers were set to restart their search Wednesday for the remains of victims of a German airliner which crashed in the French Alps, as well as for clues as to why the plane carrying 150 people went down.

The crash, killing everyone on board, occurred in apparent good weather Tuesday near the town of Prads-Haute-Bleone, after the plane made a steep eight-minute descent.

A black box had been recovered from the site, officials said.

German Chancellor Angela Merkel, French President Francois Hollande and Spanish Prime Minister Mariano Rajoy were later Wednesday due to visit the site where Germanwings flight 4U 9525 hit the ground.

The jet’s wreckage was strewn in pieces across steep terrain in a valley, meaning rescuers had to approach the site by helicopter and on foot.

Officials said initial counts indicated that there were at least 67 German citizens and 45 Spaniards on board.

It was “likely that there were some British nationals on board the flight,” the British government said.

Two Australians killed in the crash were identified as a 68-year-old mother and her 29-year-old son, Australia’s Foreign Minister Julie Bishop said in parliament. SAPA