Eight air traffic controllers are going on trial in Switzerland on charges of manslaughter and negligence over an air crash in 2002 that killed 71 people.
A Russian passenger jet collided with a cargo aircraft. Most of the victims were schoolchildren from Russia.
The eight accused were all employed by the air traffic control firm, Skyguide, at the time of the incident.
They face jail sentences of up to 15 months if found guilty, but all intend to plead innocent.
Seven of them are still working for Skyguide.
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