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The start of the second half of Saturday's game between rivals Harvard and Yale was delayed due to a protest on the field.
A group of students and alumni from both universities stormed the field at halftime to form a sit-in. The Associated Press reports students held up banners asking the schools to help with climate change and the Puerto Rican debt relief.
Some chanted, "Hey hey, ho ho, fossil fuels have got to go," and hundreds of people stormed the field, per the AP.
The protestors were asked to leave the field in order for the game to resume.