San Ysidro McDonald’s massacre
E900440
The San Ysidro McDonald’s massacre was a 1984 mass shooting at a McDonald’s restaurant in San Ysidro, California, in which a gunman killed 21 people and wounded many others, making it one of the deadliest mass shootings in U.S. history at the time.
All labels observed (1)
| Label | Occurrences |
|---|---|
| San Ysidro McDonald’s massacre canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11023928 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
Target entity: San Ysidro McDonald’s massacre Context triple: [San Ysidro, California, hasHistoricalEvent, San Ysidro McDonald’s massacre]
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A.
Santa Cruz massacre
The Santa Cruz massacre was a 1991 incident in Dili, East Timor, in which Indonesian security forces opened fire on peaceful pro-independence demonstrators, killing and wounding hundreds and drawing global attention to East Timor’s struggle.
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B.
Corpus Christi massacre
The Corpus Christi massacre was a 1971 government-led attack on student demonstrators in Mexico City, in which paramilitary forces violently repressed protesters, resulting in numerous deaths and injuries.
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C.
Columbine High School massacre
The Columbine High School massacre was a 1999 school shooting in Littleton, Colorado, in which two students murdered 13 people and wounded many others before killing themselves, becoming a defining event in debates over gun violence and school safety in the United States.
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D.
Black Friday massacre
The Black Friday massacre refers to the deadly crackdown by Iranian security forces on protestors in Tehran on 8 September 1978, a pivotal and brutal event during the Iranian Revolution.
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E.
massacre at Cholula
The massacre at Cholula was a brutal 1519 slaughter of thousands of Indigenous inhabitants by Hernán Cortés and his forces during the Spanish conquest of the Aztec Empire.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: San Ysidro McDonald’s massacre Target entity description: The San Ysidro McDonald’s massacre was a 1984 mass shooting at a McDonald’s restaurant in San Ysidro, California, in which a gunman killed 21 people and wounded many others, making it one of the deadliest mass shootings in U.S. history at the time.
-
A.
Santa Cruz massacre
The Santa Cruz massacre was a 1991 incident in Dili, East Timor, in which Indonesian security forces opened fire on peaceful pro-independence demonstrators, killing and wounding hundreds and drawing global attention to East Timor’s struggle.
-
B.
Corpus Christi massacre
The Corpus Christi massacre was a 1971 government-led attack on student demonstrators in Mexico City, in which paramilitary forces violently repressed protesters, resulting in numerous deaths and injuries.
-
C.
Columbine High School massacre
The Columbine High School massacre was a 1999 school shooting in Littleton, Colorado, in which two students murdered 13 people and wounded many others before killing themselves, becoming a defining event in debates over gun violence and school safety in the United States.
-
D.
Black Friday massacre
The Black Friday massacre refers to the deadly crackdown by Iranian security forces on protestors in Tehran on 8 September 1978, a pivotal and brutal event during the Iranian Revolution.
-
E.
massacre at Cholula
The massacre at Cholula was a brutal 1519 slaughter of thousands of Indigenous inhabitants by Hernán Cortés and his forces during the Spanish conquest of the Aztec Empire.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
crime
ⓘ
historical event ⓘ mass murder ⓘ mass shooting ⓘ |
| aftermath | McDonald’s restaurant was demolished ⓘ |
| alsoKnownAs |
McDonald’s massacre
NERFINISHED
ⓘ
San Ysidro massacre NERFINISHED ⓘ |
| category |
1984 crimes in the United States
ⓘ
attacks on restaurants ⓘ mass shootings in California ⓘ |
| city | San Diego ⓘ |
| commemoratedBy | annual remembrances in San Ysidro ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| date | 1984-07-18 ⓘ |
| duration | approximately 77 minutes ⓘ |
| endedBy | police sniper ⓘ |
| impact |
influenced law enforcement response tactics to mass shootings
ⓘ
prompted discussions on gun control in the United States ⓘ |
| legalAftermath | lawsuits filed against McDonald’s and others ⓘ |
| location | San Ysidro, San Diego, California, United States NERFINISHED ⓘ |
| mediaCoverage | extensive national and international news coverage ⓘ |
| memorial | memorial park built on former restaurant site ⓘ |
| motive | unknown ⓘ |
| neighborhood | San Ysidro NERFINISHED ⓘ |
| notableFor | one of the deadliest mass shootings in U.S. history at the time ⓘ |
| numberOfFatalities | 21 ⓘ |
| numberOfInjured | 19 ⓘ |
| numberOfVictims | 40 ⓘ |
| partOf | history of mass shootings in the United States ⓘ |
| perpetrator | James Huberty NERFINISHED ⓘ |
| perpetratorStatus | killed by police ⓘ |
| relatedTo | history of workplace and public mass shootings in the United States ⓘ |
| responseBy |
SWAT team
ⓘ
San Diego Police Department NERFINISHED ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| target | civilians ⓘ |
| timePeriod | 1980s ⓘ |
| triggeredDebateOn | mental health and access to firearms in the United States ⓘ |
| venue | McDonald’s restaurant ⓘ |
| victimDemographics | men, women, and children ⓘ |
| weaponUsed |
Uzi carbine
NERFINISHED
ⓘ
handgun ⓘ pump-action shotgun ⓘ |
| year | 1984 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Subject: San Ysidro McDonald’s massacre Description of subject: The San Ysidro McDonald’s massacre was a 1984 mass shooting at a McDonald’s restaurant in San Ysidro, California, in which a gunman killed 21 people and wounded many others, making it one of the deadliest mass shootings in U.S. history at the time.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.