A group of citizens walks before taking part in a research operation, seven days after Maelys, 9, was reported missing on September 2, 2017 in Pont-de-Beauvoisin, eastern France. French investigators have released two suspects held in connection with the mysterious disappearance of a nine-year-old girl who vanished during a wedding in the Alps nearly a week ago. / AFP PHOTO / PHILIPPE DESMAZES