Four years after the murders of a Claygate family shot in their car in the French Alps, the crime remains unsolved.

Saad Al-Hilli, 50, his wife Iqbal, 47, and her mother Suhalia Al-Allaf, 74, were gunned down in the family’s BMW on a camping holiday two miles away from the village of Chevaline near Lake Annency on September 5, 2012.

Their two young daughters survived the spree, which also saw French cyclist Sylvain Mollier shot dead on the remote forest road.

Daughter Zainab, then seven, was found near the car with critical injuries after being shot and beaten.

Her sister Zeena, four, was found unharmed by forensics teams after hiding underneath her mother’s body for eight hours.

Mr Al-Hilli’s older brother Zaid Al-Hilli, from Chessington, was arrested on suspicion of conspiracy to commit murder in 2013 but was released without charge the following year by Surrey Police.

In December last year, French detectives found new DNA evidence on the family’s BMW.

Annency prosecutor Eric Maillaud, who had described the killings as “the perfect crime”, said the new DNA was a “new lead” but that it not been matched to anyone on the European criminal data base.

Two other people had been questioned about the deaths but were also released without charge.

A Surrey Police spokeswoman said: "Surrey Police is continuing to provide support to the French investigation into the murder of four people near Annecy, southern France on September 5 2012.  

"As part of the joint investigation team, which was established following the deaths, officers from the Surrey and Sussex Major Crime Team have worked closely with the French authorities to progress a number of lines of enquiry in the UK.

"This is a complex enquiry however Surrey Police remains committed to continuing to assist the French investigation wherever possible."