Authorities are searching for three men who disappeared during a

Parents of 9-year-old who went missing on New York camping trip received ransom note before daughter was found, governor says

Evidence of Foul Play Found in Search for Missing Mothers: Authorities

What caused the disappearance of the Flannan Isle lighthouse keepers?

How to find people who are trying to disappear

How Kansas women's disappearance on a drive to pick up kids led to 4 arrests in Oklahoma, National

Family members of men missing since 1982 speak of grief after remains found in creek

Chowchilla kidnapping: How 26 kids and bus driver escaped being buried alive in 1976

What happened to Arizona teen Alissa Turney, who disappeared in 2001? - ABC News

It's just a big question mark,' authorities say about disappearance of Pennsylvania teen Kadin Black