At least three British passengers were killed in the Germanwings disaster which left 150 people dead, according to foreign secretary Philip Hammond.
The Airbus A320 flight 4U 9525 from Barcelona to Dusseldorf crashed in the French Alps after an eight-minute rapid descent.
Hammond said that "we cannot rule out the possibility" that other British people were involved in the crash.
One UK resident, Marina Bandres Lopez-Belio from Manchester, was previously reported to have been on the flight with her baby son.
Officials say that the cockpit voice recorder has arrived in Paris for investigators to examine it.
The 'black box' is believed to be damaged but it is hoped that data can be retrieved from it, the BBC reported.
Officials believe 67 of the 144 passengers on the aircraft were German citizens, including 16 pupils returning from an exchange trip.
More than 40 passengers were believed to be Spanish and the flight was also carrying people from Australia, Turkey, Denmark, Holland and Belgium.
Germanwings has announced it will make a statement at 11.30am GMT at the Leonardo Hotel Cologne/Bonn Airport in Cologne.
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