Police say a call that sparked fears of a gunman on the Yale University campus appears to have been a hoax.
Students had been urged to "shelter in place" following the security scare, but the lockdown has now been lifted.
New Haven Police Chief Dean Esserman told a news conference the campus was safe.
SWAT teams had been scrambled to the university, while students received a text message saying: "Confirmed report of person with gun on/near Old Campus. Shelter in place. This is not a test."
Yale University is in Connecticut
Police got an anonymous phone call from a phone booth at around 10am local time reporting a person on campus with a gun.
Streets close to the campus have been blockaded, and the FBI is looking at footage of the area around the phone booth to identify the caller.
Police spokesman David Harman had said: "We don't have a suspect. There's nothing tangible."
New Haven Police Department Lieutenant Jeff Hoffman said there had been no shootings and no injuries. Room-to-room searches conducted by Yale's police department found nothing untoward.
Several New Haven schools had also been placed on lockdown, as had a nearby community college.
Yale has been on November recess since Saturday, meaning many students have left to celebrate Thanksgiving.
Yale University in , Connecticut, alerted students today that a gunman was loose on campus. The university asked students to "shelter in place" and warned students who are off-campus to stay away from the university.  The university lifted the lockdown some hours later.

At 10:17 AM (), a message was sent to Yale's students from the university saying that the New Haven Police had received an anonymous phone call from a public pay phone on Columbus Avenue saying that a person with a gun was loose on the Yale campus. A further update at 11:57 am EST noted that campus police and New Haven police were both on campus. Yale's student newspaper, , reported that SWAT teams were spotted on campus.

At 1:45 PM (EST), Yale's emergency alert system indicated the lockdown was still in place, and that police officers were planning to do a door-to-door search of Yale University starting with student residences. Sources indicated that as of 1:55 PM (EST) no suspect was in custody, but the lockdown was anticipated to remain in place for "several hours."

The university lifted the lockdown at about 5 PM (EST).  Police stated the information leading to the alert was likely a prank, and if so they intended to find and prosecute the responsible party.  University vice-president Linda Koch Lorimer stated on the university's emergency alert system after the lockdown was lifted, "The safety of our community is our paramount priority. I want to underscore our collective thanks to the superb mobilization of the Yale, New Haven, and State Police, and the FBI, as well as Yale’s own Emergency Response team."


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