Yale University has lifted a four-hour lockdown police imposed after receiving a report of a gunman on campus.
The Ivy League school issued the alert Monday morning, advising anyone on campus to stay where they were.
"We've notified our community," Yale spokesman Tom Conroy said, adding that warnings were sent to students, faculty and staff by email and text. Fewer students were on campus than normal since the university is on Thanksgiving break.
Police searched room-to-room on parts of the campus. No trace of a gunman was found.
New Haven police received the initial warning call from a phone booth in the 300 block of Columbus Ave., between Howard Ave. and Hallock St. at 9:30 a.m. The man said his roommate was on his way to the Yale University campus "with the intention of shooting people," according to New Haven Police Department spokesman David Hartman.
"We have not yet identified that caller," Hartman said. "He did not identify himself when asked, he did not remain on the 911 line when asked."
A witness said he saw a gunman, but police have concluded he actually saw an armed police officer.
The police now suspect the would-be shooter was a hoax.
Some 11,250 students attend Yale University, located 80 miles northeast of New York City.