A group of students has sued Columbia University for tuition refunds after the Ivy League school moved its classes online in the wake of the COVID-19 pandemic, claiming that they had been denied the hands-on learning experiences they paid for.

The proposed class-action lawsuit, filed late Thursday in the U.S. District Court for the Southern District of New York, alleges that students for the Spring 2020 academic semester at Columbia had been unable to obtain refunds after the school announced March 12 that all classes for the remainder of the term would be conducted online.