The murders of a Claygate family remain unsolved on the third year anniversary of their deaths.

Shot in their car while on a camping holiday near Lake Annecy, Saad Al-Hilli, 50, of Oaken Lane, his wife Iqbal, 47, and her mother, Suhalia Al-Allaf, 74, were all killed three years ago today.

Last year French prosecutor Eric Maillaud said: "The further we advance, the less conviction we have. It lacks the element of a witness which allows everything to be opened up.

"We have tried everything possible, but perhaps we're in the presence of the perfect crime."

Surrey Police continue to support the French investigation into the murders.

A spokesman from the force said: "This is a complex enquiry however Surrey Police remains committed to helping find answers to what happened and continuing to assist the French investigation wherever possible."

The two Al-Hilli children, both former pupils of Claygate Primary School, survived the attack.

Zainab, then seven, was shot and pistol whipped by the gunman, and Zeena, then four, escaped unharmed after she hid beneath her dead mother’s skirt.

A French cyclist, Sylvain Mollier, 45, was also shot dead in the attack. It is thought by some that he was the original target.

At an inquest hearing last year coroner Richard Travers said it was "beyond no doubt" that Mr Al-Hilli, his wife and his mother-in-law were unlawfully killed.

Last month the house where the family lived before they were killed went on the market for £1.185m.

The four-bedroom house remains unsold.

Mr Al-Hilli and his brother had fought over ownership of the property the year before the deaths.

Zaid Al-Hilli, 54, of Bray Court, North Parade, Chessington, was arrested on suspicion of conspiracy to commit murder in July 2013 but was released without charge in January.

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