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The driver of a Tesla car, who was killed in a collision with a truck on May 7, had the self-driving car on "auto-pilot" mode.
However, it could be weeks, if not months, before officials make a final conclusion on the cause of the crash.
The incident has now sparked serious concerns over the new technology that has been gaining momentum around the world.
CCTV correspondent Jim Spellman has the story.
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