The bomb threats at Columbia University on Sunday were determined to be a “swatting” prank, according to the NYPD.
Investigators with the department are still working to determine who’s responsible for the fake emergency calls that temporarily shut down two of the university’s Manhattan buildings.
“Police conducted a search of the locations and deemed the area safe,” the NYPD said in a statement.
Cornell University and Brown University also evacuated portions of their campuses on Sunday after bomb threats, officials said.
By 7:30 p.m., authorities investigating the Cornell University threats determined they were not credible and gave an “all-clear,” according to a message posted on the school’s website.
Yale University shut down some buildings on Friday after a series of bomb threats there.
Authorities have not linked the threats against the Ivy League schools.
Yale’s Police Chief Ronnell Higgins said Sunday that it’s too early to tell if they’re connected.