(Katherine Frey/The Washington Post)

University of Maryland police said they have referred someone to campus officials for disciplinary review in connection with a noose found in the kitchen of a fraternity.

Police did not identify the “person of interest” and said no criminal charges will be filed in the matter at this time.

“Criminal charges will be applied should additional evidence meet the threshold for state or federal prosecution,” police said in a statement.

Police said they spent more than 600 hours investigating the noose reported April 27 in the kitchen of the Phi Kappa Tau chapter house. The “hate/bias investigation” also included interviews with more than 60 people and reviews of videotape and swipe-card access, according to the statement from University of Maryland police.

“UMPD is committed to creating a safe campus that is free from hate and discrimination,” U-Md. Chief of Police David B. Mitchell said in the statement. “As always, members of the UMD community are asked to reach out and report when they see hate, so we can protect our community and create a safer campus.”

Fraternity leaders with the local Phi Kappa Tau chapter said they were shocked and outraged when they found the noose, and immediately reported it to campus authorities.

The incident led to one of several hate-crime investigations, both at the campus in Maryland and among universities and colleges experiencing racial tensions nationwide.

The same month the noose was found at U-Md., officials at American University reported bananas hanging from nooses at its Northwest Washington campus.

Months later, Richard Collins III, 23, an African American college student, was fatally stabbed while visiting friends at the University of Maryland campus in College Park. Authorities arrested U-Md. student Sean Urbanski, 22, in connection with Collins’s slaying and are still investigating the case as a possible hate crime. Urbanski, who is white, was involved in an online Facebook group that posts racist and other inflammatory material.

Ellie Silverman contributed to this report.