Harvard University campus
Campus of Harvard University in Cambridge, Mass., Aug. 30, 2012. Photo by AP
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Harvard University on Monday warned of "unconfirmed reports" of explosives planted at four buildings on its Cambridge, Massachusetts campus. The school said it evacuated the buildings.

A message on the university's website read: "The Harvard University Police Department (HUPD) this morning received an unconfirmed report that explosives may have been placed in four buildings on campus:  the Science Center, Thayer, Sever and Emerson Halls. HUPD and Cambridge Police are on the scene. Out of an abundance of caution, the buildings have been evacuated while the report is investigated.  Harvard's focus is on the safety of our students, faculty and staff.  We will update the media when we have more information."

Harvard's campus is located in a crowded urban area adjoining Boston. Students this week were scheduled to take final exams.

The school, founded in 1636, has about 21,000 students.

It was the latest in a series of security scares at U.S. schools and universities. Three days ago a Colorado high school student intent on confronting a teacher opened fire at his school, severely wounding a classmate before killing himself.

Late last month Yale University in New Haven, Connecticut, placed its campus on lockdown for most of a day, after an anonymous caller warned officials that his roommate was headed to the school planning to shoot people. No gunman was found.