The Ivy League school has experienced an outbreak of type B meningococcal disease. Seven students and one student visitor have been stricken by the bacterial illness since March.
Gov. Chris Christie decided to schedule a primary for August and a special general election for October.
The hostages are safe and the suspect is dead, police said.
A hostage situation persisted in Trenton, N.J., Saturday morning, after a woman and a child were found dead inside a home.