Authorities in Boston are investigating an intentional explosion that rocked Harvard Medical School early Saturday morning, prompting an extensive response from local and federal law enforcement. Fortunately, no injuries were reported, but investigators say the incident was deliberate.
According to the Boston Fire Department, the explosion occurred around 2:48 a.m. inside the Goldenson Building, part of Harvard’s Longwood Medical campus. Responding officers arrived after a fire alarm was triggered — just moments after witnesses spotted two masked individuals fleeing the area.
Surveillance footage reportedly shows the suspects wearing hooded clothing and face coverings as they exited through a side door shortly after the blast. Authorities believe the pair may have detonated a small improvised device in a fourth-floor hallway.
Boston Police, the Harvard University Police Department (HUPD), and the FBI’s Joint Terrorism Task Force are now collaborating on the investigation. While officials stopped short of calling it terrorism, they confirmed the blast was “intentional and criminal in nature.”
“We’re treating this as a serious criminal act,” said Boston Police Commissioner Michael Cox. “We’re pursuing multiple leads and reviewing video from the surrounding campus area.”
The explosion caused minor damage to a section of wall and ceiling but did not compromise the building’s structure or research facilities. The Boston Fire Department Arson Unit inspected the site and found no additional explosive devices.
Harvard Medical School issued a statement reassuring staff and students that the campus is secure and operations will resume as normal. “We are cooperating fully with authorities and taking all necessary precautions to ensure the safety of our community,” the university said.
The Goldenson Building houses several research labs and administrative offices, making the timing and location of the explosion particularly concerning. Investigators have not disclosed whether the device was placed inside a lab or public area, and a motive remains unclear.
“It could be anything from vandalism to an attempted message,” said retired FBI special agent Thomas Powers. “The deliberate nature of the blast raises serious questions about motive and intent.”
Local residents reported hearing a loud “boom” shortly before police sirens filled the area. “It shook my windows — I thought it was construction,” said one witness who lives nearby.
So far, no arrests have been made, but officials are urging anyone with video or information to contact the Boston Police tip line.
The incident comes amid heightened security concerns across several U.S. campuses following recent bomb threats and online extremist chatter. While authorities emphasize that there’s no ongoing danger, the FBI is expanding its forensic analysis of the device fragments to determine how it was built and whether it matches any known explosive patterns.
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