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. 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.
Police had 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. 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.
Monday’ 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.