Monmouth University in New Jersey was placed on a lockdown early Tuesday morning after students and faculty had received an email from someone claiming to have a bomb and that they were armed and hiding on campus.
University and local police responded to the incident and told the campus community to shelter in place.
After a search of campus buildings, no evidence was found to substantiate the threat, the university said in a statement.
The lockdown had been lifted as of 9:05 a.m. and classes will have a delayed opening.
"All of us are thankful that this situation was resolved safely and successfully, and we appreciate the support and cooperation we received from our students and staff who adhered to the shelter-in-place restriction," university President Patrick F. Leahy said. "On behalf of the university, I would like to express my appreciation for the efforts of the responding law enforcement agencies who assisted in our investigation."