A fire alarm went off around noon on Monday at Davis Library.
Department of Public Safety spokesperson Randy Young said the Chapel Hill Fire Department was investigating after the alarm went off on the second floor.
"There is not a reason for concern," he said.
Students filed out and filled the Davis courtyard waiting for the library to reopen. They sat on the ground with their laptops, notes and lunches while the main doors were closed.
Sophomore Alex Lutton said she heard the alarm go off and the announcement say, 'This is not a drill.'