求boy missing,police puzzled 第一段和最后一段

Police in America have stepped up their search for a fifteen-year-old boy who went missing two days ago in Dover,New Hampshire.People have shown great interest in his disappearance due to sightings of puzzling lights in the sky and reports of alien visits around the time of his disappearance.Police have not ruled out the possibility that Justin was taken by aliens,but are also looking into other possibilities.'Some people make up such amazing stories,' says Detective Sam Peterson,who has taken charge of the case.'So we've been looking at other possibilities too,such as murder.We will not give up until we find convincing evidence.’