Police questioned a planeload of Hong Kong-bound passengers after a bomb threat forced a British Airways jumbo jet to make an emergency landing in Germany.
Flight BA 031 from London had to turn around over Poland and fly to Berlin's Tegel Airport, the nearest major airport, after a letter found in a toilet warned that a bomb had been planted on the plane.
The airline has refused to disclose the exact contents of the letter or who found it.
'A letter was found in a toilet. It warned that there was a bomb on board. All we can say at this stage is that it was written in English,' said Gemma Moore, the airline's spokeswoman in London.
All 283 passengers and crew were escorted from the plane when it landed in Berlin early on Wednesday night.
The jumbo, its cargo, baggage and mail were searched twice for explosives by experts from Germany's Federal Border Police, who by last night had found nothing suspicious.
The emergency landing came three hours after the flight took off from Heathrow Airport in London.