A cousin of Mr Al-Hilli, who was contacted in Baghdad but refused to be identified, said: If you investigate and find out about Saads job, you will know whos behind his killing.
The cousin, who lives in Istanbul but was on a business trip to Baghdad, added: We have been told by the police not to say anything more.
It is believed that French police are examining Iraqi-born Mr Al-Hillis work with Surrey Satellite Technology Limited (SSTL).
Intelligence sources said the company had been of interest to MI5 for ten years during which time the security service had conducted surveillance operations on British-based individuals who had made contact with SSTL.
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