Updated at 2:47 p.m.: All four buildings have been searched and are clear. The buildings are all open again, and students, faculty and staff are allowed to enter the buildings.
Updated at 2 p.m.: Harvard University reported that "Sever Hall and Harvard Yard are cleared and students may return. Science Center still closed."
Updated at 1 p.m.: Harvard University reported that "Thayer and Emerson Hall are cleared and students may return. Sever and Science Center are still closed."
Updated at 12:22 p.m.: Regarding the UMass Boston incident, Mass State Police is reporting that the threat was a "false report." Shortly before noon, UMass Boston Tweeted that the McCormack Building was being evacuated after a report of a "possible person with a firearm."
Updated at 12:03 p.m.: Harvard University said the "report of bombs on campus remains unconfirmed. Federal and state officials have joined the probe."
Updated at 11:57 a.m.: Meanwhile, at another nearby campus... UMass Boston is reporting that the school's McCormack Building is being evacuated after the report of a "possible person with a firearm."
Updated at 11:36 a.m.: CBS News is reporting that President Obama has been briefed on the situation at Harvard.
Updated at 11:33 a.m.: WCVB is reporting that the MBTA has completed its sweep of the Harvard MBTA station and the station is secure.
Updated at 10:47 a.m.: State Police said that bomb teams are searching the four buildings involved in the "threat."
Updated at 10:18 a.m.: MBTA said the Red Line has not been affected by the ongoing investigation and evacuations at Harvard.
Updated at 10:10 a.m.: Fox News is reporting that Homeland Security is part of the investigation along with multiple law enforcement agencies.
Updated at 10:06 a.m.: This week is exam week at Harvard. The morning exams have been postponed because of the situation.
Updated at 9:55 a.m.: State Police troopers from the Bomb Squad and K9 are responding to Harvard University.
WCVB is reporting that MBTA Transit Police are doing a sweep of the Harvard station.
Original article posted at 9:40 a.m. Monday:
Harvard University officials say they received and have unconfirmed that explosives may have been placed in four buildings on campus.
The Science Center, Thayer, Ever and Emerson buildings are all being evacuated while they investigate.
"Harvard's focus is on the safety of our students, faculty and staff. We will update the media when we have more information," officials said in a statement on their website this morning.
Harvard University Police, along with Cambridge Police are on scene and investigating.
Patch will bring you more information as it becomes available.