NEW YORK (CNN) -- A rally Wednesday afternoon at Columbia University was held to protest the discovery of a noose on the office door of an African-American professor. The noose was found Tuesday, hanging from a door at Columbia's Teachers College. http://www.cnn.com/2007/US/10/10/columbia.noose/ var CNN_ArticleChanger = new CNN_imageChanger('cnnImgChngr','/2007/US/10/10/columbia.noose/imgChng/p1-0.init.exclude.html',2,1);//CNN.imageChanger.load('cnnImgChngr','imgChng/p1-0.exclude.html');The noose was found Tuesday at Columbia's Teachers College, said Joe Levine, executive director for external affairs at Teachers College. The New York Police Department is investigating the matter as a hate crime. The apparent target, Madonna Constantine, 44, is a professor of psychology and education at Teachers College. She co-wrote the book "Addressing Racism: Facilitating Cultural Competence in Mental Health and Educational Settings." Constantine issued a statement saying, "I am upset that the Teachers College community has been exposed to such an unbelievably vile incident, and I would like us to stay strong in the face of such a blatant act of racism. How does this say racism? Were blacks the only people ever hung? I thought this was a way of execution in the old west days.