rafael romo has that. >> reporter: the remains belonging to 19-year-old alexander moore are the first to be identified. he's one of the 43 students from a rural teacher's college in southern mexico who went missing in september. the student's father said forensics identified his son using only a bone fragment. at protest in mexico city saturday night, a group of parents acknowledged the announcement, but said the search for the rest of the group is not over. my son, wherever you are, i'll keep looking for you, even if my heart is breaking by the news, this father said. the mexican attorney general announced the investigation is still open. based on my own conviction and the orders of the president, we're going to continue with this investigation until we