FBI - Contact US Missing and Abducted Children If your child has been kidnapped or harmed, immediately contact your local field office or the closest international office. Other key contacts: ■To report a missing child or the sighting of a missing child, you can also contact the National Center for Missing and Exploited Children by calling 1-800-THE-LOST or by visiting its website. ■To report child sexual exploitation, use the electronic Cyber Tip Line or call 1-800-843-5678. The Cyber Tip Line is operated by the National Center for Missing and Exploited Children in partnership with the FBI and other law enforcement agencies. ■If your child is being abducted internationally by a family member and is not yet abroad, contact the U.S. Department of State. (Link to go to here) This page also has FBI Field Office Websites to go to.