Campus Alert Archive
UCSD

A Pinged Cell Phone Near LionTree Arena Locks Down North Campus at UC San Diego

CAarmed personemergency notificationmedium confidence
UnfoundedNo evidence of an actual threat was found. The institutional response is documented because the alert communication is identical to what would occur during a real incident.

On January 17, 2025, UC San Diego locked down the northern portion of its La Jolla campus after San Diego CrimeStoppers received an anonymous call reporting a woman being held against her will. San Diego Police pinged the woman's phone to the area of the LionTree Arena (formerly RIMAC Arena), prompting a multi-hour police search. The suspect was eventually contacted off campus and the all-clear was issued at 1:11 p.m. PST.

Alerts
3
Response
—
Killed
0
Injured
0
Institution
University of California, San Diego
Public R1 · CA
~42,000 studentsEverbridgeTriton Alert
Confirmed Timeline

Alert Sequence

3 messages in sequence · 2 verified verbatim

Some alert texts below are approximate reconstructions from news coverage, not confirmed verbatim transcripts. Reconstructed texts are shown in italic with a dashed border. Verified verbatim texts have a solid border and are marked accordingly.

INITIAL ALERTSMS
Verified verbatimTimes of San Diego direct quote of the 10:56 a.m. PST Triton Alert / Timely Warning71 chars
Possible Armed Suspect. Avoid North Campus. Lock doors and stay inside.
Verbatim text confirmed by direct quotation in Times of San Diego, NBC 7 San Diego, 10News, and Fox 5 San Diego — all reporting the alert exactly as 'Possible Armed Suspect. Avoid North Campus. Lock doors and stay inside.'
RIMAC Arena was renamed LionTree Arena in 2024 following a naming gift; the alert itself did not include the building name
First Triton Alert SMS in the sequence; alarm triggered by a CrimeStoppers tip and cell phone ping rather than a confirmed sighting
UPDATESMS+1h 30m
Approximate reconstructionThe Triton live updates page; text reconstructed from its paraphrase that the 12:26 p.m. PST notification confirmed this was not an active shooter situation168 chars
Triton Alert Update: This is not currently an active shooter situation. UCPD continues to search the North Campus area. Continue to avoid the area and shelter in place.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

The Triton reported the Triton Alert system sent this notification at 12:26 p.m. PST on January 17, 2025 confirming the incident was not an active shooter event; the exact wording is paraphrased in coverage, so it is logged as not verbatim-confirmed
Active-shooter denial language is increasingly common in campus alerts after social-media-driven panic during similar searches
Maintains shelter-in-place instruction even as it downgrades the perceived threat level
ALL CLEARSMS+2h 15m
Verified verbatimThe Triton (UCSD student news) live updates page directly quoting the 1:11 p.m. PST Triton Alert all-clear91 chars
ALL CLEAR. The suspect has been contacted off campus. There is no ongoing threat to campus.
Verbatim text quoted in The Triton's 'Live Updates: Timely Warnings' page; matches the wording reported by NBC 7 San Diego and 10News
All-clear issued approximately 2 hours and 15 minutes after the initial alert
Use of 'contacted off campus' rather than 'arrested' suggests the encounter did not result in immediate criminal charges; University Communications later confirmed neither party was UCSD-affiliated
Context

Background

The January 17, 2025 lockdown began with an anonymous San Diego CrimeStoppers tip claiming a woman was being held against her will. San Diego Police pinged her cell phone to the area of LionTree Arena, the multi-purpose recreation and athletics venue on UC San Diego's North Campus. The pinged location triggered a police response and the first Triton Alert at 10:56 a.m. PST, which warned of a 'possible armed suspect' and instructed the campus to lock doors and avoid the area. The phrasing 'possible armed suspect' is unusual; most campus alerts use 'reported' or 'confirmed' language to convey threat certainty. UCSD's January 17 alert sequence reflects a tension between Clery Act timeliness requirements and the reality that initial reports often prove incomplete. The all-clear was issued approximately two hours and fifteen minutes after the first alert, after officers contacted the subject off-campus.
Analysis

Key Findings

Cell phone pinging by police can place innocent locations under emergency lockdown when initial reports turn out to be inaccurate
UCSD's mid-incident clarification that this was 'not an active shooter situation' reflects best practice for limiting social media-driven panic
The renaming of RIMAC Arena to LionTree Arena created brief naming confusion in the alert text
The tip-driven nature of this lockdown makes it a useful case study in how anonymous reports can trigger major campus response without any confirmed threat
Outcome
Suspect contacted off campus by approximately 1:11 p.m. PST. No weapon recovered on campus and no injuries reported. UCSD Police later clarified the incident was not an active shooter situation.
Provenance

Sources

  1. News
    Report of possibly armed person at UCSD prompts campus lockdown (NBC 7 San Diego)
    nbcsandiego.com
  2. Student Paper
    North Campus shut-down resolved, armed suspect near RIMAC/LionTree Arena identified (UCSD Guardian)
    ucsdguardian.org
  3. News
    UC San Diego Placed on Lockdown During Police Search for Armed Suspect (Times of San Diego)
    timesofsandiego.com
  4. News
    UPDATE: All clear given following report of possibly armed person on UCSD campus (10News)
    10news.com
Tags
armed-personcampus-lockdownuc-systemcaliforniasan-diegoshelter-in-placeunfounded-threattriton-alertcrimestoppers-tipUnfounded
Added May 2026Updated May 2026Via ingestion