Key Points
- Logan David Patterson, 18, from Plymouth, Massachusetts, and Dominick Frank Cardoza, 20, from Bourne, Massachusetts, pleaded guilty to one count of conspiracy to damage a building by means of fire and an explosive.
- The incident occurred on 1 November 2025, at around 2:33 a.m., when the two men allegedly lit a large commercial firework, such as a Roman candle, inside a laboratory locker on the fourth floor of the Goldenson Building at Harvard Medical School.
- The explosion caused minor damage to the facility, which houses a research lab in Harvard Medical School’s Department of Neurobiology; no injuries were reported.
- Federal prosecutors, led by U.S. Attorney Leah Foley, announced charges on 4 November 2025; both men were arrested that day and faced up to five years in prison if convicted.
- In March 2026, the men reached a plea deal recommending zero to six months’ imprisonment (no prison required), 36 months’ supervised release, full restitution for damages, and a $100 court fee.
- A plea hearing was set for 21 April 2026; recent reports confirm the guilty pleas were entered around 24 April 2026.
- Initial court appearances occurred on 4 November 2025 in Boston federal court, with orders to stay away from Harvard buildings.
- Surveillance footage captured the suspects wearing face coverings, lighting the firework, climbing scaffolding to access the roof at 220 Longwood Avenue, Boston, and triggering a fire alarm about 10 minutes later.
Cambridge(Cambridge Tribune) April 24, 2026 – Logan David Patterson and Dominick Frank Cardoza have pleaded guilty in the federal case stemming from an explosion at Harvard Medical School’s Goldenson Building last year.
What Led to the Guilty Pleas in the Harvard Explosion Case?
The guilty pleas mark a resolution to a case that began with a predawn explosion on Halloween night in 2025. As reported by U.S. Attorney Leah Foley during a 4 November 2025 press conference covered by WHDH, the two defendants “were seen on surveillance cameras at 2:33 a.m. on 1 November 2025 wearing face coverings and lighting what appeared to be a Roman candle.”
Federal prosecutors detailed that the men then climbed scaffolding on the side of 220 Longwood Avenue, accessed the roof, and placed the firework inside a locker in a fourth-floor neurobiology research lab, leading to the blast that activated the fire alarm. According to a statement from the U.S. Attorney’s Office for the District of Massachusetts, as cited in The New York Times on 4 November 2025, the charge is “conspiracy to cause damage using an explosive device.”
Both Patterson and Cardoza, who were 18 and 20 at the time of arrest, faced initial federal charges announced by the FBI Boston and the U.S. Attorney’s Office. WHDH reporter noted on 3 November 2025 that “Logan David Patterson, 18, of Plymouth, and Dominick Frank Cardoza, 20, of Bourne, are each charged with one count of conspiracy to damage, by means of an explosive, the Goldenson Building.” U.S. Attorney Leah Foley added, “The conduct alleged in the charging documents was not only irresponsible and risky, but it also was criminal and there are consequences for those who commit federal crimes.”
Who Are the Accused and What Evidence Linked Them?
Logan David Patterson of Plymouth and Dominick Frank Cardoza of Bourne, both Massachusetts residents, were identified through surveillance footage and social media trails, as detailed in Fox News coverage on 4 November 2025. The report stated, “Logan David Patterson, 18, of Plymouth, and Dominick Frank Cardoza, 20, of Bourne, were arrested and federally charged in an alleged conspiracy to damage a building on Harvard Medical School’s campus using a large commercial firework.”
The Harvard Crimson, in an article dated 4 November 2025, reported that “18-year-old Logan D. Patterson of Bourne and 20-year-old Dominick F. Cardoza of Plymouth were arrested Tuesday morning for their alleged involvement in the explosion,” with Foley confirming at the press conference that “the two allegedly set off a Roman candle firework on the fourth floor of the building.”
CBS News Boston on 4 November 2025 covered their initial court appearance: “Logan David Patterson, 18, of Plymouth, and 20-year-old Dominick Frank Cardoza of Bourne, were arrested Tuesday. Both had an initial appearance in federal court in Boston later in the afternoon.” The men were ordered to stay away from all Harvard buildings.
NBC News on 4 November 2025 noted potential penalties: “If found guilty, they could potentially face a maximum sentence of five years in prison, along with three years of supervised release and fines reaching up to $250,000.” It remains unclear from reports whether they had legal representation at the time.
What Does the Plea Deal Entail?
The plea agreement, first reported by Plymouth Independent on 18 March 2026, specifies that “Logan Patterson, of Plymouth, and Dominick Cardoza, of Bourne, each agreed to plead guilty to a single count of conspiracy to damage a building by means of fire and an explosive.”
A U.S. Attorney’s Office spokesperson told the outlet via email that the office “will not recommend a specific sentence until a sentencing memo is filed closer to the sentencing date.” The deal recommends zero to six months for both, with no prison sentence required, alongside 36 months of supervised release, full restitution for the damaged locker, and a $100 court fee. The plea hearing was scheduled for 21 April 2026, aligning with recent confirmations of the pleas.
Patch.com, in the original story prompting this coverage, headlined “2 Men Accused of Causing Harvard Medical School Explosion Plead Guilty,” confirming the development in Cambridge.
Background of the Development
The incident traces back to early 1 November 2025, amid Halloween festivities, when campus police responded to a fire alarm in the Goldenson Building at Harvard Medical School. The building, located at 220 Longwood Avenue in Boston’s Longwood Medical Area, hosts neurobiology research labs critical to Harvard’s medical studies. Minor damage was confined to a single locker, with no disruption to ongoing research or injuries, as per initial federal statements.
Charges were filed swiftly, reflecting the seriousness of targeting an educational and research facility. The case proceeded through federal court in Boston, with plea negotiations culminating in early 2026. This development follows standard federal handling of explosive-related offences on campus properties.
Prediction: Impact on the Harvard and Local Community
This guilty plea resolution can affect the Harvard Medical School community, including researchers, students, and staff in neurobiology labs, by closing a security incident that briefly heightened concerns over facility access and safety protocols. The minor damage and lack of injuries mean operations resume without long-term setbacks, but the imposed supervised release and restitution terms may reinforce stricter scaffolding and rooftop access controls at Harvard properties.
For the broader Cambridge and Boston academic audience, particularly young residents and students aware of the case, it underscores federal consequences for misuse of fireworks or explosives near institutions, potentially influencing peer behaviour during holidays like Halloween. Local Plymouth and Bourne communities, home to Patterson and Cardoza, may see limited direct effects beyond family notifications, as sentencing remains pending without mandatory prison time.
