A Northwestern University dorm in Evanston, Ill., on Wednesday was put into lockdown over reports of a gunman on campus, the same day students across the country walked out of their classes to protest gun violence.

As of 4:50 p.m. Wednesday, the lockdown was still in place and police were investigating the incident, according to the university's Twitter account.

There is a report of a person with a gun in Engelhart Hall at the corner of Emerson Street and Maple Avenue. Evanston and Northwestern University police are on the scene. Seek shelter if in the area. — Northwestern (@NorthwesternU) March 14, 2018

But police later announced that "no evidence of a victim, scene or gunman" had been found, not long after reports that shots had been fired.

Evanston and NUPD in the area of Emerson and Maple. Report of gunman and shots fired in a residential building. Area checked no evidence of a victim, scene, or gunman found. — Evanston, IL Police (@EvanstonPD) March 14, 2018

A school official had told the newspaper that shots were reported at Engelhart Hall, which contains dorms for graduate students and their family members.

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The report comes exactly one month after 17 people were killed at Marjory Stoneman Douglas High School in Parkland, Fla., where former student Nikolas Cruz allegedly opened first with an AR-15 rifle that he bought legally the year before.

Students called on lawmakers in school walkouts across the country on Wednesday to enact stricter gun control laws.

Updated: 4:52 p.m.