Harris and Klebold were initially reported to be members of a clique that was called the "Trenchcoat Mafia," despite later confirmed that the pair had no connection to the group and furthermore did not appear in the group's photo in Columbine High's 1998 yearbook. Harris' father erroneously stated that his son was "a member of what they call the Trenchcoat Mafia" in a call he made on April 20, 1999. Klebold attended the high school prom three days before the shootings with a classmate named Robyn Anderson.