" nor any clues whatsoever"
http://www.bbc.co.uk/news/world-europe-19506889 (dated Nov 2013)
Are there any clues as to the killer or killers?
Several witnesses reported seeing a car speeding away from the scene around the time the attack took place. According to the British cyclist, this was a "green or other dark-coloured four-wheel drive car". Police say they are looking for a right-hand drive BMW 4x4. The BBC's Panorama programme spoke to a forestry worker who said he saw both a British car and a motorcycle, suggesting the killer was not acting alone. French investigators have released an artist's impression of a motorcyclist they want to speak to. The sketch was apparently not circulated early on in the investigation for fear the man would go into hiding. Police believe an antique 7.65mm calibre Luger pistol was used. Ballistics tests on 25 spent cartridges found at the scene apparently showed the same weapon was used to kill all four people. Mr Maillaud said the victims had been "targeted" rather than shot in a hail of indiscriminate fire.