According to the San Francisco State University Police, one person has been detained.
Police now say their investigation has concluded and they have found that the package was not a threat to public safety.
An alert to students was sent out at 3:25 p.m. and said people should avoid the area and shelter in place. The campus is located at 1600 Holloway Ave.
As of 4 pm, police have lifted the shelter in place for all other parts of campus. Authorities say the Library will resume normal activities on Tuesday.