Three Britons were among the 150 people killed when a passenger jet crashed in the French Alps, the Foreign Secretary has said.
But Philip Hammond said he could not rule out this number rising.
He was speaking as recovery teams resumed their search at the crash site in hazardous terrain.
Overnight rain and snow at the crash site has made the rocky ravine slippery, increasing problems in reaching the area.
Investigators are also examining the black box voice recorder of the doomed Germanwings aircraft in the hunt for clues as to what caused the Airbus A320 to come down without issuing a mayday call.
The French authorities said although the black box had been damaged, it is thought to be “useable”.
Although officials insist no cause has been ruled out, terrorism is not considered likely.
Images of the area show the plane had completely disintegrated, with the fuselage smashed into small pieces, the largest of which is about the size of a small car.
German foreign minister Frank-Walter Steinmeier was flown over the site and called it “a picture of horror”.
The plane was en route from Barcelona in Spain, to Dusseldorf, Germany, when it came down on Tuesday morning less than an hour into its flight at Meolans-Revels, between Barcelonnette and Digne.
None of the 144 passengers and six crew survived the crash.
Among those on board were 16 children and two teachers from the same school in Haltern Am See in Germany were on the plane, returning home after an exchange visit.
The head teacher of the school said: “I am shell-shocked and speechless.”