i guess, you know, panic kicked in. reporter: it s all part of an international appeal to the public for more information about madeleine s disappearance. even if it s just 0.1% chance she is alive, we will continue to fight for her. reporter: part of the push? scotland yard releasing computer-generated sketches of a man they say was in the area at the time madeleine van issued. the man who is white with dark hair had a child in his arms. the child is described as being between 3 and 4 years of age with blond hair and possibly wearing was jammass so that itself is significant information. reporter: a 25-minute re-enactment of that night has been shown on television and giving updated time line and allowed them to eliminate old theories and explore new avenues in the investigation. madeleine s parents say they have never given up hope that they will find their little girl. we don t know what has happened to madeleine. we don t know who has taken her. probably our best chance