I tend to believe that it is the intelligence agencies, but crime is always possible, and one can't rule anything out.
There are some odd hints in this report from a news story today:
"I saw an English car coming up the road from the village," said Mr Fillion-Robin, who has not yet been interviewed by police. "There were no other cars with it. I did not see or hear any other cars pass by that afternoon."
The house is the final property before the road climbs 3km to the car park in a national park above Lake Annecy.
Police have revealed that the Iraq-born Mr Hilli, 50, his dentist wife Ikbal, 47, his Swedish mother-in-law Suhaila al-Allaf, 74, and a cyclist, Sylvain Mollier, 45, were each shot two times in the head and that 25 bullets were fired in the attack.
Mr Fillion-Robin said: "I didn't hear any shooting. You do hear shooting from the hunters sometimes but I didn't hear anything that afternoon. Perhaps they had a silencer."
The builder, who lives in a nearby village, said it was "bizarre" for the family to have gone to the car park. "It is not the sort of place that families with young children or older people would go to," he said.
There is something odd about that car park in the high area of the nature reserve, and the witness is not saying exactly what it is.
I have been gleaning the internet for background information on this area. First of all, it's hard to identify the location in Google Earth or Google Maps. There are a number of photos of the crime scene with reporters swarming over it. I believe it was a one shot deal. They had to walk about two miles to get there, I believe. You can follow the road to the place which must be the "car park" but it's hard to match it up with the pictures. The road rises from 1828 ft to 2460 ft, but it is running along the bottom of a valley with two steep forested slopes on either side. In Google Earth, it's hard to distinguish the paths and trails which go on from there from the one lane road. However if you pay attention to the vertical relief, you can reconcile the view with the pictures, I think. Anyway, this has to be it, although I'd certainly be interested in other opinions.
The strange thing about his going there with his family is that it is nothing but a dead end unless you are equipped for some challenging mountain hiking or biking.
The man's defense industry connections are probably more of interest but maybe its something else. Wonder if she had any famous clients or identified someone questionable based on dental records?