The USA Department of Justice coordinates programs to track and prosecute child pornography offenders across all jurisdictions, from local police departments to federal investigations, and international cooperation with other governments.[19] Efforts by the Department to combat child pornography includes the National Child Victim Identification Program, the world's largest database of child pornography, maintained by the Child Exploitation and Obscenity Section of the United States Department of Justice and the National Center for Missing and Exploited Children (NCMEC) for the purpose of identifying victims of child abuse.[89][90] Police agencies have deployed trained staff to track child pornography files and the computers used to share them as they are distributed on the Internet, and they freely share identifying information for the computers and users internationally.[91]