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 lock down 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.