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NEW HAVEN, Conn. (AP) -- New Haven authorities say they have not found a gunman on Yale's campus and are leaning toward a call warning of an armed man heading to shoot up the school being a hoax.
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 remains in effect on the Old Campus as police search rooms to confirm that no gunman is on campus.
There have been no reports of shots fired or anyone injured and no arrests have been made.
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.
THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.
An anonymous caller warned authorities Monday that his roommate was on his way to Yale University to shoot people, leading officials to lock down the Ivy League campus as police searched for a gunman.
The hunt, which came as the school was on November break, was stymied by students who had stayed behind and were afraid to open their doors, police said.
The lockdown was partially lifted at 3:10 p.m., with the exception of the Old Campus and Calhoun College sections of campus.
A 911 call was received at 9:48 a.m. from a man at a pay phone about a mile from the campus, said Officer David Hartman, a New Haven Police spokesman.
"All he really said was that his roommate was on his way to the university, to Yale University, to shoot people," he said.
Police later received reports from witnesses who reported seeing someone with a gun, Hartman said. But he said it was possible they had simply seen officers responding to the initial call.
There was nothing specific about the threat, he said, and the call lasted only seconds. There were no reports of shots fired or anyone injured.
Police blocked off several streets near the university's Old Campus, in the heart of New Haven, where they were concentrating their search. Several local schools also were placed in lockdown. Police in tactical gear entered several campus buildings, and a helicopter hovered over the area. Pedestrian traffic in the normally bustling area was sparse, with cold and windy weather keeping many people inside.
The response included several police departments, the FBI and other federal agencies, Hartman said. Authorities were conducting a room-by-room search of buildings, he said.
Yale advised students and staff members to shelter in place. The school also issued an advisory asking people off campus to stay away from the area.
Many students and staff members left campus for the Thanksgiving holiday following Saturday's traditional football game against Harvard.
But many others were still in their dorm rooms, Hartman said. Police were having difficulty gaining access to some rooms because those locked inside were not convinced they were dealing with law enforcement, he said. Most rooms don't have peepholes.
"Using an abundance of caution, we're still going ahead with those searches," Hartman said.
Yale sent out an email telling community members that officers would be slipping a Yale ID under the door or using keys to gain access.
Undergraduate classes are set to resume Dec. 2
Yale has been the target of violence in the past. In May 2003, a bomb damaged an empty classroom and adjacent reading room at the law school.
A Yale professor, David J. Gelernter, was seriously injured in 1993, when a mail bomb mailed by Theodore Kaczynski, the man known as the Unabomber, exploded in his campus office.
Friday's search came several weeks after a scare on another Connecticut campus.
Central Connecticut State University was in lockdown for several hours Nov. 4 after reports by witnesses of a masked man carrying a gun or sword.
Police arrested a student, David Kyem, who said he had been wearing a ninja-like Halloween costume and meant no harm. He faces charges including breach of peace.
Copyright 2013 Scripps Media, Inc. The Associated Press contributed to this report. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.
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