Gunshots were reported at the MBTA stop at Harvard Square on Sunday afternoon, according to an emergency alert by Harvard University.

The university alerted that authorities were searching for the suspect.

The university issued a shelter-in-place warning: “Please enter the nearest building and stay there until all clear is given.”

The Harvard alert said that transit police are reporting shots fired at the stop.

The MBTA posted on X at about 2:25 p.m. that there would be delays of 25 minutes due to “police activity” at Harvard.

Cambridge police, state police and Harvard campus police were searching Harvard Square for the suspect, according to the alert.