By far the most common kind of child abduction is parental child abduction and often occurs when the parents separate or begin divorce proceedings. A parent may remove or retain the child from the other seeking to gain an advantage in expected or pending child-custody proceedings or because that parent fears losing the child in those expected or pending child-custody proceedings; a parent may refuse to return a child at the end of an access visit or may flee with the child to prevent an access visit or fear of domestic violence and abuse.
Parental child abductions may be within the same city, within the state region or within the same country, or may be international. Studies performed for the U.S. Department of Justice's Office of Juvenile Justice and Delinquency Prevention reported that in 1999, 53% percent of family abducted children were gone less than one week, and 21% were gone one month or more.
Read more about Parental Child Abduction at Wikipedia.