Actress Daryl Hannah congratulated the student activists and called on Yale and Harvard "to divest." "When it comes to the further destruction of our planet #nobodywins," she tweeted.
The demonstration delayed the second half of the game for at least 45 minutes, NBC Boston reports. Police and security officials cleared the field so the game could resume.
Shortly after action resumed at Yale Bowl, an Ivy League competitor, Dartmouth College, clinched a 29-23 victory over Brown University, which means that the Yale Bulldogs need to beat Harvard to earn a share of the Ancient Eight title.