AlpsRelatives of the two girls who survived the shooting of a British family in the Alps had arrived in France Saturday as police prepared to enter the victims' home in Britain to search for clues into the unexplained murders. "Members of the family arrived in France last night, a man and a woman, accompanied by a British social worker," prosecutor Eric Maillaud told AFP. He said he did not know which of the couple was directly related to the children and it was not clear when exactly they would be able to see the youngest of the survivors -- four-year-old Zeena. "I don't know when they will be able to see the little girl. We have to be sure it can be done without problems," he said. He said meetings would be "systematically" carried out in the presence of French investigators. Zeena has been in the care of French authorities since the brutal attack on Wednesday, which saw Saad al-Hilli, a 50-year-old Briton born in Iraq, his wife Ikbal and his 74-year-old mother-in-law gunned down in a forest car park in an Alpine tourist area. Their seven-year-old daughter Zainab was left for dead and remains in a medically induced coma after being shot and badly beaten in the attack. Zeena survived the attack and hid undetected for eight hours under her dead mother's skirts. A local man, 45-year-old Sylvain Mollier, was also killed after apparently stumbling on the attack on the family's car. It was unclear whether Hilli's brother, who has denied reports he had a financial dispute with the victim, was one of the two family members who arrived in France. Police investigating the murders have been unable to obtain much useful information from Zeena, who they have described as "traumatised". Maillaud said the little girl no longer had any role to play in the probe. "For her it's over," he said. He said the elder sister Zainab was still in an artificial coma as of late Friday. "Her injuries are extremely serious," he said, though officials have said her life is not in danger and that her condition improved after surgery. Investigators are pinning their hopes on Zainab, who they have described as a "key witness" in a case that has so far left them baffled. Autopsies were concluded overnight Saturday, Maillaud said, but the results were not yet being released. Authorities were due to speak to journalists later Saturday. Three French gendarmes arrived in Britain on Friday to coordinate with British police and another was due to arrive on Saturday. A French police source told AFP investigators would begin searching the family's home in Surrey, a British county southwest of London, on Saturday morning. "The search will begin this morning," the source said, adding that French investigators would first be briefed by British counterparts on local procedures. The source said the search would be "very long" and would go "beyond the day". French and British police would also to meet for a strategy session and to form investigation teams. The family were killed in their British-registered BMW estate car in a forest car park near the village of Chevaline in the picturesque Haute-Savoie region. Each had been shot multiple times, including at least once in the head. About 25 spent bullet casings were found near the vehicle and police have said they suspect more than one shooter may have been involved.