The University of Papua New Guinea has brought police on to both the Waigani and Taurama campuses in the wake of Thursday's violent clashes.
Police said four vehicles were set on fire belonging to the University's security force, Uniforce, as well as a fifth private vehicle.
The University bookshop building was also burnt.
Police said they believed a number of university staff, including security officers, were injured in the violence.
Deputy Police Commissioner and Chief of Operations Jim Andrews said the latest action was criminal and Police Forensic staff as well as CID were on campus to investigate.
Mr Andrews said offenders would be identified and charged accordingly.
He said police would maintain a strong presence on both campuses to protect life and state assets as long as necessary.
Two weeks ago police fired on students at the campus who were protesting against the Prime Minister Peter O'Neill, with a number getting seriously hurt.