New Haven Police Chief Dean Esserman said at a news conference Monday afternoon that New Haven and the Yale campus are both safe.
A lockdown was ended for the entire campus Monday afternoon after police spent the day searching rooms to confirm that no gunman was on campus.
New Haven police Officer David Hartman says an anonymous caller from a pay phone nearby told them his roommate had a gun and was heading to the campus.
Esserman says police hope to track down and arrest the caller.
