France says Niger Frenchmen 'killed in cold blood'
The two men, both 25, were abducted by four gunmen from a restaurant in the capital Niamey on Friday night.
Mr Fillon has suggested they were murdered as the attempted rescue took place the following day.
"The hostage-takers, seeing they were pursued, killed the hostages in cold blood, according to the first elements in my possession," he said.
But a senior Niger military official told Reuters news agency that the bodies were found away from the scene of the clash, implying that they were probably "executed" before the rescue mission.
Relatives have reportedly asked to see the bodies.
French anti-terror police have already arrived in Niger to investigate the deaths.
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