Alps murder: DNA found at scene 'could be that of killer'

These are believed to include spent gun cartridges and even parts of the murder weapon which mysteriously broke during the attack.

The DNA does not match any of the people who first arrived at the scene of the killings, including British cyclist Brett Martin an ex RAF Serviceman who raised the alarm and three French hikers.

Now Mr Maillaud has asked for saliva samples of all the police and medics who dealt with the early investigation.

This is to ensure that the scene was not contaminated with their DNA something which the authorities made every effort to avoid.

The DNA is being analysed by scientists at the gendarmes national criminal research institute, the IRCGN, near Paris.

Samples have also been delivered to Christian Doutremepuich, a professor who runs a state-of-the-art laboratory in Bordeaux, in south west France.

Mr Maillaid said the research protocols of the two centres were very different ensuring the best possible chance of linking the DNA with the killer.

"This is a classic procedure," said Mr Maillaud. "It means that we do not put all our eggs in one basket."

Mr Maillaud said that they needed to ensure the DNA was not a result of "pollution at the scene" before making an effort to link it with known hitmen and other criminals who may be living abroad.

The aim is to build up a complete database of everyone who approached the al-Hillis car, and the surrounding areas, said Mr Maillaud, who said that a tight security perimeter had been put in place within hours of the crime.

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Alps murder: DNA found at scene 'could be that of killer'