{ "id": "2025-11-01-harvard-university-goldenson-building-explosion", "slug": "harvard-university-goldenson-building-explosion-2025-11-01", "institution": { "name": "Harvard University", "shortName": "Harvard", "state": "MA", "type": "private-r1", "alertSystemName": "MessageMe / HUPD", "enrollment": 23731 }, "incident": { "date": "2025-11-01", "type": "explosion", "cleryCategory": "timely-warning", "resolution": "confirmed-threat", "headline": "Overnight explosion traced to a firework set off in a locker; two arrested", "headlinePublic": "Overnight explosion traced to a firework set off in a locker; two arrested", "summary": "At 2:48 AM EDT on Saturday November 1, 2025, a Harvard University Police Department officer responding to a fire alarm at the Goldenson Building at 220 Longwood Avenue [observed two unidentified individuals fleeing the building](https://www.hupd.harvard.edu/news/2025/11/timely-warning-explosion-goldenson-building-boston) and discovered evidence of an explosion on the fourth floor. The Boston Fire Department Arson Unit determined the [explosion appeared to be intentional](https://www.thecrimson.com/article/2025/11/2/explosion-longwood/), and HUPD issued a Clery timely warning the same day. No injuries occurred; two young men later admitted to detonating a commercial-grade firework in a locker as a prank.", "outcome": "No injuries. Boston Police swept the building for additional devices; none were found. On November 4, 2025, Logan David Patterson, 18, of Bourne, MA, and Dominick Frank Cardoza, 20, of Plymouth, MA, were arrested by federal agents and charged with conspiracy to damage by fire or explosive a building receiving federal financial assistance. They pleaded guilty in April 2026, telling the court they had detonated a commercial-grade firework in a locker outside a lab; the blast damaged hallway walls but not the lab itself.", "casualties": { "killed": 0, "injured": 0 } }, "alerts": [ { "sequence": 1, "type": "initial", "channel": "email", "timestamp": "2025-11-01T13:35:00-04:00", "verbatimText": "At approximately 2:48 AM this morning, a Harvard University Police Department officer was dispatched to the Goldenson building at 220 Longwood Avenue, Boston, for a fire alarm activation. Upon arrival at the building, the officer observed two unidentified individuals fleeing the building. The officer attempted to stop the individuals before proceeding to the floor where the alarm had been triggered.\n\nUpon entering the building, the officer determined that an explosion had occurred in an area on the 4th floor. The Boston Fire Department Arson Unit responded and made an initial assessment that the explosion appeared to be intentional. The Boston Police Department conducted a sweep of the building to check for any additional devices; none were found.\n\nNo injuries were reported as a result of this incident.\n\nThe Harvard University Police Department is actively investigating this incident in coordination with local, state, and federal law enforcement partners.\n\nIf anyone has information regarding this incident, please contact the Harvard University Police Department’s Detective Bureau at 617-495-1796.\n\nFor questions about this message, please contact the Harvard University Police Department’s Public Information Officer, Steven G. Catalano, at 617-495-9225 or by email at steven_catalano@hupd.harvard.edu.\n\nDisseminated at 1:35 PM on Saturday, 11/1/25.", "isVerbatimConfirmed": true, "confidence": "high", "sourceUrl": "https://www.hupd.harvard.edu/news/2025/11/timely-warning-explosion-goldenson-building-boston", "sourceDescription": "HUPD Timely Warning: Explosion at Goldenson Building", "annotations": [ "Issued as a Clery Act timely warning under the categorization of an arson or explosive incident on a building receiving federal financial assistance", "The Goldenson Building houses Harvard Medical School neurobiology research laboratories, the explosion occurred on the fourth floor outside a lab, in a hallway locker", "The decision to release the warning as a written HUPD bulletin rather than a MessageMe SMS reflected that the threat had already been contained by the time the warning was issued; community members were not in active danger", "The phrase 'observed two unidentified individuals fleeing the building' became the basis for the FBI and HUPD photographic appeal that led to identifying Patterson and Cardoza within 72 hours", "seq 1 email. Dual-blind two independent open_page reads (curl/jina 403 Akamai). sha256 1675277d7049cd6e4897bd164993ecdc9933acaf15a1e64e36ae7d43fc3dbb42. Lowercase Goldenson building and 4th floor preserved. U+2019 in Department's preserved. Product ends at Disseminated at 1:35 PM on Saturday, 11/1/25.", "Distinct incident from 2025-10-24-harvard-university-sherman-street-shooting-shelter-in-place and 2024-10-26-harvard-university-adams-house-randolph-burglary: Goldenson Longwood explosion vs Cambridge Sherman SIP vs Adams House burglary.", "2026-09-21 consolidation (rule 9, one incident = one case): merged with the earlier case file harvard-medical-school-explosion-2025-11-01 (case id 2025-11-01-harvard-medical-school-explosion), whose 819-character capture stopped at \"No injuries were reported as a result of this incident.\" and carried a 3:00 PM timestamp that the product's own \"Disseminated at 1:35 PM\" line contradicts; this full product and its November 4 close-out supersede it." ], "characterCount": 1366 }, { "sequence": 2, "type": "update", "channel": "email", "timestamp": "2025-11-04T13:25:00-05:00", "verbatimText": "CLOSE OUT\n\nArrest made.\n\nEarlier this morning, acting on a tip received by law enforcement, investigators positively identified and arrested two suspects. The arrests were made by a multi-jurisdictional team that included the Harvard University Police Department, the Federal Bureau of Investigation, and local and state police departments.\n\nThere is no ongoing threat to public safety in connection with this incident or the individuals involved.\n\nDisseminated at 1:25PM on Saturday, 11/4/25.", "isVerbatimConfirmed": true, "confidence": "high", "sourceUrl": "https://www.hupd.harvard.edu/news/2025/11/timely-warning-explosion-goldenson-building-boston", "sourceDescription": "HUPD CLOSE OUT: Goldenson explosion arrests", "annotations": [ "seq 2 CLOSE OUT on the same HUPD page, above the original warning. 1:25PM has no space before PM. sha256 a84265fb719db2422a00312008eb2ad9ad4bd563a2dcd350757c679f6391cb9a." ], "characterCount": 493 } ], "context": "The November 1, 2025 explosion in Harvard Medical School's [Goldenson Building at 220 Longwood Avenue](https://www.thecrimson.com/article/2025/11/2/explosion-longwood/) prompted a rapid, federally assisted arson investigation. At [approximately 2:48 AM EDT](https://www.hupd.harvard.edu/news/2025/11/timely-warning-explosion-goldenson-building-boston), an HUPD officer responding to a fire alarm at the building observed two individuals fleeing and subsequently discovered evidence of an explosion on the fourth floor. The Boston Fire Department Arson Unit deemed the blast intentional. HUPD issued a [Clery timely warning later that day](https://www.hupd.harvard.edu/news/2025/11/timely-warning-explosion-goldenson-building-boston) describing the response sequence and a photographic appeal for the two suspects. The investigation moved quickly: [Logan David Patterson, 18, and Dominick Frank Cardoza, 20, were arrested by federal agents on November 4, 2025](https://www.thecrimson.com/article/2025/11/5/hms-explosion-arrests/) and charged with conspiracy to damage by fire or explosive a building receiving federal financial assistance. In April 2026, [both pleaded guilty](https://www.bostonglobe.com/2026/04/24/metro/harvard-medical-school-explosion-guilty/), their attorneys characterized the act as 'doing stupid things' rather than ideological violence, and the men admitted to detonating a commercial-grade firework in a locker outside a lab. The case is notable for this archive because Harvard chose a written HUPD timely warning rather than a MessageMe SMS push (consistent with Harvard's general preference for written advisories when the threat has been contained) and because the post-Marathon-bombing protocol (rapid federal involvement, FBI assistance, immediate photographic appeal) was applied to what turned out to be a fireworks prank rather than a terror act. The Goldenson Building [houses neurobiology research](https://www.nbcboston.com/news/local/harvard-medical-school-explosion/3837968/) and was structurally undamaged; no labs were affected. HUPD posts timely warnings at [hupd.harvard.edu/news](https://www.hupd.harvard.edu/news). Official product: the [Goldenson building explosion timely warning](https://www.hupd.harvard.edu/news/2025/11/timely-warning-explosion-goldenson-building-boston).", "keyFindings": [ "The timely warning was issued the same day as the 2:48 AM EDT explosion on November 1, 2025 but distributed as a written HUPD bulletin rather than a MessageMe push (Harvard's standard pattern for contained incidents)", "The phrase 'observed two unidentified individuals fleeing the building' supplied the photographic-appeal hook that led to arrests within 72 hours", "The Boston Fire Department Arson Unit's same-day 'appeared to be intentional' assessment escalated federal involvement immediately, mirroring post-2013-Marathon investigative posture", "Both suspects later pleaded guilty to conspiracy to damage by fire or explosive a federally-funded building, the act was a commercial-grade firework detonated in a locker, not an ideological attack", "No injuries occurred and no labs were damaged; the structural impact was limited to hallway wall damage on the fourth floor", "The case is one of several 2024-2025 Harvard-affiliated arson/explosion incidents that the institution treated with formal Clery warnings rather than emergency notifications", "Official HUPD timely warning for an apparent intentional explosion on the Goldenson 4th floor, with a November 4 arrest close-out." ], "sources": [ { "title": "HUPD Timely Warning: Explosion at Goldenson Building", "url": "https://www.hupd.harvard.edu/news/2025/11/timely-warning-explosion-goldenson-building-boston", "type": "official-archive", "accessDate": "2026-09-21", "archiveUrl": null, "archiveNotes": "SPN not attempted after 500 flap at 07:36Z. Live curl 403 Akamai; open_page dual-blind recovered the body." }, { "title": "Authorities Investigating Explosion at Harvard Medical School, Believed To Be Intentional (The Harvard Crimson)", "url": "https://www.thecrimson.com/article/2025/11/2/explosion-longwood/", "type": "student-newspaper" }, { "title": "Two Arrested, Face Federal Charges in Harvard Medical School Explosion Case (The Harvard Crimson)", "url": "https://www.thecrimson.com/article/2025/11/5/hms-explosion-arrests/", "type": "student-newspaper" }, { "title": "Explosion at Harvard Medical School building appears intentional: police (NBC Boston)", "url": "https://www.nbcboston.com/news/local/harvard-medical-school-explosion/3837968/", "type": "local-media" }, { "title": "Two men plead guilty to causing explosion at Harvard Medical School last fall (Boston Globe)", "url": "https://www.bostonglobe.com/2026/04/24/metro/harvard-medical-school-explosion-guilty/", "type": "local-media" }, { "title": "Two Arrested in Connection with Explosion on Harvard Medical School Campus (DOJ - District of Massachusetts)", "url": "https://www.justice.gov/usao-ma/pr/two-arrested-connection-explosion-harvard-medical-school-campus", "type": "official-statement" } ], "confidence": "high", "tags": [ "private-r1", "massachusetts", "harvard", "explosion", "ivy", "clery", "arson", "timely-warning", "goldenson-building", "longwood-campus", "harvard-medical-school", "boston", "fireworks-prank", "federal-charges" ], "dateAdded": "2026-05-14", "lastUpdated": "2026-09-21", "addedBy": "ingestion" }