The story

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 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. Read full article »

CNN's Allan Chernoff, Rob Frehse and Andrea Stout contributed to this report.

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