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The armed robbers stole the diamond is worth 350 million euros ($467 million) and gem is added to a plane on Monday night in Brussels airport, the Belgian national broadcasting company VRT reports.
Officials say, carrying four armed personnel safety car near the Swiss aircraft.
"Men armed with screen shots. Is there any chance of fired, no one was hurt, a spokeswoman in Brussels prosecutors said."
The two car accelerated after the robbery, one of them was later found, officials said, who also do not comment on what.
The robber breakthroughs, around the airport fence, on the tarmac, Brussels airport spokesman said.