After an “unconfirmed bomb threat’’ at Harvard University on Monday afternoon evacuated four buildings and restricted entry to Harvard Yard, officials said that evening the affected areas have been determined safe and re-opened.

“Nothing to substantiate the emailed threat has been found and the investigation regarding the source is ongoing,’’ the university said on its emergency webpage at 5:40 p.m.

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The Science Center, Sever, Emerson, and Thayer halls were evacuated around 12:30 p.m., Harvard officials said, and access to Harvard Yard was restricted.

“The safety and security of members of the Harvard community is always our top priority,’’ Harvard Executive Vice President Katie Lapp said in a statement. “In the wake of recent tragic events in locations ranging from Paris to Beirut and beyond, we understand that this type of threat will cause great anxiety for many across our campuses. We will continue to be vigilant as we carry on Harvard’s mission of expanding and disseminating knowledge.’’

The four evacuated buildings are outlined in red. —Harvard campus map


Several other Massachusetts schools also received bomb threats on Monday.

Cambridge police said they received an anonymous blog post on Monday morning that said someone was planning to bomb “cambridge mass city schools.’’ All school buildings were searched, and nothing “unusual’’ was found, Superintendent of Schools Jeffrey Young said.

In addition, Cape Cod Community College canceled classes on Monday morning from a threat, and Fitchburg State temporarily evacuated its McKay campus.

The Cambridge Fire Department and other law enforcement officials responded to Harvard’s campus, according to The Harvard Crimson reporters.

Fire dept closing off the yard pic.twitter.com/BD8zOH1m64 — Meg Bernhard (@meg_bernhard) November 16, 2015