Explosion at Harvard Medical School Building: What Really Happened Inside Goldenson Hall

Authorities are investigating an early morning explosion that struck a Harvard Medical School building in Boston on Saturday, November 1, 2025. Officials say the blast, which occurred on the fourth floor of the Goldenson Building, appears to have been intentional.

The Harvard University Police Department (HUPD) responded around 2:48 a.m. local time after a fire alarm was triggered. Officers arriving on scene reported seeing two individuals running from the building moments after the alarm sounded. Upon entry, investigators discovered evidence of an explosion on the upper floors.

Officials Confirm Intentional Explosion at Harvard Medical School

The Boston Fire Department’s Arson Unit was called to assist and later confirmed that the blast “appeared to be intentional.” No injuries were reported, and a full sweep of the building found no additional explosive devices. The FBI and other federal law enforcement agencies have joined the investigation alongside HUPD and the Boston Police Department.

According to campus authorities, surveillance cameras captured two suspects fleeing the scene. Both appear to be young men wearing hooded sweatshirts and masks. One suspect wore a tan or light brown hoodie with “NYC” printed on it, khaki pants, and gray Crocs. The second suspect wore a dark hoodie and plaid pajama pants. Their identities remain unknown as of Sunday morning.

Harvard University confirmed the details in a statement, noting that the school is cooperating with local, state, and federal agencies. Officials also released the surveillance photos to encourage public assistance in identifying the suspects. Anyone with information is urged to contact the Harvard University Police Department’s detective bureau at 617-495-1796.

Investigators have not shared details about the type of explosive used. A source familiar with the case told reporters that the device was “not a bomb,” but did not elaborate on what caused the blast. Authorities continue to collect forensic evidence from the fourth floor of the Goldenson Building, which houses several medical research laboratories.

Campus Reaction and Security Review Underway

The explosion has raised serious security concerns at Harvard’s Longwood Medical Area, one of the most research-intensive sections of the university. Staff and students were temporarily restricted from entering parts of the Goldenson Building, though no other buildings on campus were evacuated.

Campus safety officials have begun reviewing access protocols and emergency alert systems. While classes and research resumed later in the day, several labs remain closed pending inspection. University administrators assured the community that safety remains the top priority and that additional patrols have been deployed around the area.

Federal agents and arson investigators are continuing to analyze evidence from the scene. They are also reviewing security footage from surrounding buildings in hopes of tracking the suspects’ movements before and after the explosion.

In summary, the explosion at Harvard Medical School was deemed intentional by authorities. No one was injured, but the investigation is ongoing. With the FBI’s involvement, law enforcement officials are determined to identify the suspects and ensure the safety of the campus community.

FYI (keeping you in the loop)-

Q1: When did the Harvard Medical School explosion happen?

The explosion occurred around 2:48 a.m. local time on November 1, 2025, inside the Goldenson Building on Harvard’s Boston campus.

Q2: Was anyone injured in the explosion?

No injuries were reported. The building was evacuated and searched, and no additional devices were found.

Q3: Who is investigating the Harvard Medical School explosion?

The Harvard University Police Department is leading the investigation with assistance from the Boston Fire Department Arson Unit, Boston Police, and the FBI.

Q4: Are there any suspects?

Yes. Two unidentified men were captured on security cameras fleeing the building shortly after the explosion. Their images have been released to the public.

Q5: What was the motive behind the explosion?

The motive remains unclear. Investigators have confirmed the incident appears to have been intentional, but no group or individual has claimed responsibility.

References

Associated Press. (2025). Explosion at Harvard Medical School appears to have been intentional, authorities say. November 1, 2025.

People. (2025). Authorities Investigating Explosion at Harvard Medical School That ‘Appeared to Be Intentional’. November 1, 2025.

The Harvard Crimson. (2025). Police, FBI Investigate Explosion at Harvard Medical School Goldenson Building. November 2, 2025.