French investigators say the two sisters who survived the 2012 massacre of their family in the French Alps may take part in a reenactment at the crime scene, as detectives try to extract fresh memories of the attack. Saad Al-Hilli, his wife Iqbal, her mother Suhaila and a local cyclist were shot dead near Lake Annecy in 2012, while the Al-Hillis' young daughters, Zainab and Zeena, survived; the case, which shocked Europe, remains unsolved 13 years on. Nanterre cold case prosecutor Marie-Celine Lawrysz said bringing the sisters, now 18 and 21, back to the scene could help investigators uncover new details through specialist trauma-interview techniques, though a date depends on the women's consent and funding for the trip.

The development follows the recent discovery of a rare Luger pistol at the bottom of Lake Annecy, matching the type of Swiss military sidearm believed to have been used in the killings based on hand-grip fragments found at the scene. Magistrate Sabine Khéris had earlier determined the weapon was manufactured in 1935, one of only 940 such Lugers made that year, and suggested the killer was calm and methodical, likely trained in "double tap" shooting. Forensic experts at Nanterre's cold case unit will now compare the newly recovered gun, and any DNA or serial-number evidence it yields, with the original fragments from the murder scene.