Tensions ran high on Thursday evening as Philadelphia school board members voted to pass a controversial $3 billion facilities master plan.
School district leaders say they decided to cancel classes after consulting with the Allentown Police Department.
Mastery High School of Camden was closed Wednesday following the death of a beloved custodian.
Threats were made against Woodbury City Public Schools, the Deptford Township School District, the Haddon Heights School District and Glassboro Public Schools.
Among the new students at Temple University are 300 transfers coming from the University of Arts, which shuttered in June.
Former students, faculty, and staff are expected to attend and talk about the impacts the closure had on them and the community.