Prosecutor in French murder probe to visit UK By Laura Smith-Spark, CNN September 12, 2012 -- Updated 1520 GMT (2320 HKT) French police stand guard near the French Alpine village of Chevaline after the shootings. A French prosecutor and judge will visit London as they probe murders in the Alps Two of the victims, an Iraqi couple, lived in Surrey, south of London Who was behind the deadly shooting and why remains a mystery Surrey Police officers have been helping French investigators with their inquiry London (CNN) -- A French prosecutor and judge working on the investigation into the murder of four people in the French Alps last week are to travel to London to meet with British authorities, UK police said Wednesday. Prosecutor Eric Maillaud and Judge Michel Mollin are expected in London on Thursday. Two of those killed in the brutal shooting, Saad and Ikbal al-Hilli, lived in the well-heeled town of Claygate, in the English county of Surrey. They were found last Wednesday shot to death in a car near France's Lake Annecy, along with Ikbal al-Hilli's 74-year-old mother. The al-Hillis' two daughters survived, one with wounds from a beating and a gunshot. Authorities have been tight-lipped about possible perpetrators and motives in the attack. Investigators have been searching for clues at the al-Hillis' home in Claygate since the weekend. Bomb squad clears suspicious items in shooting Surrey Police said Wednesday it is "continuing to provide all possible support, including the provision of specialist search teams" at the Claygate address. The force has also provided officers to work with the families of the victims, the police statement said. Last week's attack on the al-Hilli family was, in the words of Maillaud, an "unheard-of savagery." A French cyclist, Sylvain Mollier, was killed alongside the British-Iraqi family members on the outskirts of Chevaline, an Alpine village near the picturesque Lake Annecy and popular with outdoor enthusiasts. Each victim had two gunshot wounds to the head. 'Slaughter at Chevaline': More questions than answers While the couple's 7-year-old daughter was badly beaten and shot, their 4-year-old daughter was unharmed. She hid for hours behind her dead mother's legs before she was found by police. French authorities plan to question the elder girl, named in media reports as Zainab, when she is in "a fit mental state," Maillaud said Monday. The girl is also being protected by police in case of a further threat to her safety. She came out of a medically induced coma Sunday, the French prosecutor's office said. Saad al-Hilli, born in Iraq in 1962, was a naturalized British citizen who lived south of London with his family. He was an engineer working at Surrey Satellite Technology, a high-tech company owned by EADS, an aerospace corporation that builds satellites. CNN's Stephanie Halasz contributed to this report.