DURHAM, New Hampshire — More than 10 cases of COVID-19 have been traced to a fraternity party where people did not follow public health guidelines, the president of the University of New Hampshire said.

In a Sunday letter to the university community, UNH President James Dean said more than 100 students and non-students attended the Aug. 29 party at the Theta Chi fraternity.

“Let me be clear: this is reckless behavior and the kind of behavior that undermines our planning and will lead to us switching to a fully remote mode,” Dean said in the letter.

He called the party “reprehensible” and said student conduct charges would be pursued against the organizers of the party and all students who attended the event.

The fraternity was placed under interim suspension and Dean ordered a moratorium on any in-person gatherings of any size within the fraternity, or sorority system or other social groups.

Meanwhile, the university said anyone who attended the party should self-quarantine and contact UNH Health & Wellness.