A group of Harvard students, alumni, and faculty blocked the entrances to a building on campus on Sunday night as part of an activist group’s ongoing efforts to persuade the university to end its $36.4 billion endowment’s investment in fossil fuels because they have been identified as a cause of climate change.

The protesters, who estimated that about 200 people took part, split into three groups to block the entrances to Massachusetts Hall, a building on campus that houses administrative offices as well as freshman dorm rooms.

The protesters said they saw about a dozen Harvard police present. The scene was peaceful, said Jasmine Opie, a junior at Harvard and a member of Divest Harvard, the group behind the protest.