{ "id": "2025-10-18-uc-san-diego-geisel-library-knife-brandish", "slug": "uc-san-diego-geisel-library-knife-brandish-2025-10-18", "institution": { "name": "University of California, San Diego", "shortName": "UCSD", "state": "CA", "type": "public-r1", "alertSystemName": "Triton Alert" }, "incident": { "date": "2025-10-18", "type": "weapons", "cleryCategory": "timely-warning", "resolution": "arrest", "headline": "Punch and knife brandished at Geisel Library; suspect later arrested", "headlinePublic": "Punch and knife brandished at Geisel Library; suspect later arrested", "summary": "UC San Diego Police [issued a Clery timely warning after a 1:00 p.m. weapons-law violation at Geisel Library](https://ucsdcampusnotices.atlassian.net/wiki/spaces/CN/pages/126683259/Timely+Warning+Weapons+Law+Violation+-+10-18-2025). Following a verbal argument the suspect punched the victim and brandished a knife, then fled. The knife was displayed and not used in the assault. Police were notified at 1:06 p.m. A same-day [arrest update](https://ucsdcampusnotices.atlassian.net/wiki/spaces/CN/pages/126157154/ARREST+MADE+-+UPDATE+to+Triton+Alert+Weapons+Law+Violation+-+10-18-2025) said the subject returned later, Geisel Security helped locate him inside the library, and he was arrested.", "outcome": "Suspect arrested later the same afternoon after returning to Geisel Library." }, "alerts": [ { "sequence": 1, "type": "initial", "timestampApprox": "2025-10-18T13:06:00-07:00", "channel": "email", "verbatimText": "UC SAN DIEGO POLICE DEPARTMENT\n\nOctober 18, 2025\n\nALL ACADEMICS, STAFF, AND STUDENTS AT UC SAN DIEGO\n\nTimely Warning – Weapons Law Violation\n\nOn October 18, 2025 at 1:06PM, the UC San Diego Police Department received a report of a weapons law violation that occurred at the UCSD Geisel Library at approximately 1:00PM. The reporting party stated that following a verbal argument, the suspect punched the victim and brandished a knife, before fleeing the area. The suspect only displayed the knife and the knife was not used in the assault.\n\nThe suspect is described by the victim as a light-skinned, male adult, approximately 25-30 years old with curly shoulder length blonde hair with a purple headband, wearing a black sleeveless shirt, gray leggings with a black stripe down the side, carrying a backpack.\n\nAt this time, the suspect is not in custody.\n\nThe report is currently under investigation by the UC San Diego Police Department.\n\nIf you have information that could be helpful in this investigation, please call the UC San Diego Police Department at (858) 534-4357 or submit an online tip at https://police.ucsd.edu/services/anonymous.html.\n\nThe remainder of this message provides general information about preventing and reporting a weapons law violation and is not necessarily related to this incident.\n\nReport suspicious activity immediately to the UC San Diego Police Department by calling or texting 9-1-1.\n\nYour safety is most important. If you are confronted with someone who says they have a gun, knife or other weapon, believe them.\n\nTry to maintain a calm demeanor. Don’t make sudden moves or try to apprehend the criminal yourself.\n\nUse the UC San Diego Safety Escort Program. Call (858) 534-WALK, available daily from dusk to dawn.\n\nWhenever possible, travel well-lit, busy routes. Avoid walking or parking in shadowed areas. Have your keys in your hand as you approach your door.\n\nKnow the location of Campus Emergency Telephones on routes to and from campus destinations.\n\nWhat is this Notice?\n\nThis notice is being provided to you to comply with the Jeanne Clery Campus Safety Act. Timely Warnings are intended to prevent similar crimes and to provide information that will assist community members in protecting themselves.\n\nUniversity of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093", "isVerbatimConfirmed": true, "confidence": "high", "sourceUrl": "https://ucsdcampusnotices.atlassian.net/wiki/spaces/CN/pages/126683259/Timely+Warning+Weapons+Law+Violation+-+10-18-2025", "sourceDescription": "UC San Diego Campus Notices wiki: Timely Warning Weapons Law Violation 10-18-2025 (Geisel Library)", "annotations": [ "Dual independent Confluence REST fetch 2026-08-24. CDATA html sha256 3941c0a2f6c8c87260f10e7c523ca520e1b311b6a1fad6850cf53ad5b51c6fba. Flattened from the embedded UCPD email body. En dash preserved. SPN save-sync HTTP 302.", "Distinct from 2025-10-18-uc-san-diego-piedra-sixth-floor-ebike-burglary (same calendar date; different location Piedra 6th-floor bike rack, different crime e-bike burglary).", "Distinct from 2025-12-19-uc-san-diego-bookstore-knife-display (later date, bookstore disturbance) and from 2025-11-06-uc-san-diego-warren-field-soccer-aggravated-assault (Warren Field soccer punch, no knife)." ], "characterCount": 2324 }, { "sequence": 2, "type": "update", "timestampApprox": "2025-10-18", "channel": "email", "verbatimText": "UC SAN DIEGO POLICE DEPARTMENT\n\nOctober 18, 2025\n\nALL ACADEMICS, STAFF, AND STUDENTS AT UC SAN DIEGO\n\nARREST MADE - UPDATE to Triton Alert – Weapons Law Violation\n\nThe UC San Diego Police Department has made an arrest in connection with the case of a subject brandishing a knife at the UCSD Geisel Library. Later in the afternoon, the subject returned to the Geisel Library where Geisel Security Staff assisted UC San Diego Police in locating the subject inside the library. The subject was subsequently arrested on various charges.\n\n***Original Message***\n\nOn October 18, 2025 at 1:06PM, the UC San Diego Police Department received a report of a weapons law violation that occurred at the UCSD Geisel Library at approximately 1:00PM. The reporting party stated that following a verbal argument, the suspect punched the victim and brandished a knife, before fleeing the area. The suspect only displayed the knife and the knife was not used in the assault.\n\nThe suspect is described by the victim as a light-skinned, male adult, approximately 25-30 years old with curly shoulder length blonde hair with a purple headband, wearing a black sleeveless shirt, gray leggings with a black stripe down the side, carrying a backpack.\n\nAt this time, the suspect is not in custody.\n\nThe report is currently under investigation by the UC San Diego Police Department.\n\nIf you have information that could be helpful in this investigation, please call the UC San Diego Police Department at (858) 534-4357 or submit an online tip at https://police.ucsd.edu/services/anonymous.html.\n\nThe remainder of this message provides general information about preventing and reporting a weapons law violation and is not necessarily related to this incident.\n\nReport suspicious activity immediately to the UC San Diego Police Department by calling or texting 9-1-1.\n\nYour safety is most important. If you are confronted with someone who says they have a gun, knife or other weapon, believe them.\n\nTry to maintain a calm demeanor. Don’t make sudden moves or try to apprehend the criminal yourself.\n\nUse the UC San Diego Safety Escort Program. Call (858) 534-WALK, available daily from dusk to dawn.\n\nWhenever possible, travel well-lit, busy routes. Avoid walking or parking in shadowed areas. Have your keys in your hand as you approach your door.\n\nKnow the location of Campus Emergency Telephones on routes to and from campus destinations.\n\nWhat is this Notice?\n\nThis notice is being provided to you to comply with the Jeanne Clery Campus Safety Act. Timely Warnings are intended to prevent similar crimes and to provide information that will assist community members in protecting themselves.\n\nUniversity of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093", "isVerbatimConfirmed": true, "confidence": "high", "sourceUrl": "https://ucsdcampusnotices.atlassian.net/wiki/spaces/CN/pages/126157154/ARREST+MADE+-+UPDATE+to+Triton+Alert+Weapons+Law+Violation+-+10-18-2025", "sourceDescription": "UC San Diego Campus Notices wiki: ARREST MADE update Weapons Law Violation 10-18-2025", "annotations": [ "Dual independent Confluence REST fetch 2026-08-24. CDATA html sha256 29809f7f70138eec24f57c1b4685a2fa3e1f1b9e622cc4b866bbdf40868fc0f4. Flattened from the embedded UCPD email body including the quoted original. SPN save-sync HTTP 302.", "Subject returned to Geisel Library later the same afternoon, located with Geisel Security Staff assistance, and arrested on various charges." ], "characterCount": 2742 } ], "context": "UC San Diego Police posted both notices on the Campus Notices wiki, linked from [police.ucsd.edu/alerts/warnings.html](https://police.ucsd.edu/alerts/warnings.html). The same-day I-5 Camp Pendleton freeway community bulletin is a traffic notice, not an emergency, and was not filed.", "keyFindings": [ "After a verbal argument at Geisel Library the suspect punched the victim and brandished a knife, then fled. The knife was displayed and not used in the assault.", "Suspect described as a light-skinned male adult, about 25-30, curly shoulder-length blonde hair with a purple headband, black sleeveless shirt, gray leggings with a black stripe, backpack. Arrested after returning to the library." ], "sources": [ { "title": "Timely Warning – Weapons Law Violation - 10-18-2025", "url": "https://ucsdcampusnotices.atlassian.net/wiki/spaces/CN/pages/126683259/Timely+Warning+Weapons+Law+Violation+-+10-18-2025", "type": "official-archive", "accessDate": "2026-08-24", "archiveUrl": "https://web.archive.org/web/20260824105445/https://ucsdcampusnotices.atlassian.net/wiki/spaces/CN/pages/126683259/Timely+Warning+Weapons+Law+Violation+-+10-18-2025" }, { "title": "ARREST MADE - UPDATE to Triton Alert – Weapons Law Violation - 10-18-2025", "url": "https://ucsdcampusnotices.atlassian.net/wiki/spaces/CN/pages/126157154/ARREST+MADE+-+UPDATE+to+Triton+Alert+Weapons+Law+Violation+-+10-18-2025", "type": "official-archive", "accessDate": "2026-08-24", "archiveUrl": "https://web.archive.org/web/20260824105505/https://ucsdcampusnotices.atlassian.net/wiki/spaces/CN/pages/126157154/ARREST+MADE+-+UPDATE+to+Triton+Alert+Weapons+Law+Violation+-+10-18-2025" } ], "confidence": "high", "tags": [ "public-r1", "california", "ucsd", "weapons", "timely-warning", "2025" ], "dateAdded": "2026-08-24", "lastUpdated": "2026-08-24", "addedBy": "ingestion" }