{
 "publisher": "DroneLedger",
 "site": "https://droneincidents.com",
 "generated": "2026-10-15T21:51:35+00:00",
 "release": "20261015T215135433783-da8a1a",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "DroneLedger (droneincidents.com)",
  "excludes": "Quoted source passages and linked articles remain the copyright of their publishers; they are included as short quotations for verification. Linked media and satellite images remain the rights holders' property; no image or video licence is granted by this dataset. Fonts (SIL OFL) and map data (Natural Earth, public domain) keep their own terms. City and region names in automatically published dossiers are checked against GeoNames (geonames.org, CC BY 4.0). Drone drawings and animations are schematic illustrations of a type, not evidence about any incident."
 },
 "assessmentNote": "DroneLedger assessment, not a finding. Editorial likelihood bands, not calibrated statistical confidence intervals. Unknown has no numeric probability. Outcomes are attributed reports; no totals or inference of intent from a hit.",
 "assessmentScale": {
  "version": "di-estimative-v1",
  "levels": {
   "almost_certain": {
    "low": 95,
    "high": 99
   },
   "very_likely": {
    "low": 80,
    "high": 95
   },
   "likely": {
    "low": 55,
    "high": 80
   },
   "roughly_even_chance": {
    "low": 45,
    "high": 55
   },
   "unlikely": {
    "low": 20,
    "high": 45
   },
   "very_unlikely": {
    "low": 5,
    "high": 20
   },
   "almost_no_chance": {
    "low": 1,
    "high": 5
   },
   "unknown": {
    "low": null,
    "high": null
   }
  }
 },
 "evidenceNote": "Each dossier separates three claims: drone presence, impact and attribution, each with its own evidence state and supporting sources. 'reported' means a source describes the claim without sufficient identification evidence; claims by parties to a conflict are never 'confirmed' on their own. Counts reflect dossiers in this curated archive, not all incidents worldwide. windowStart/windowEnd are reporting-window calendar bounds, not individual event days; legacy date remains the compatibility/sorting date for such records.",
 "locationNote": "lat/lon are the dossier's own approximate coordinates (see locationPrecision) and are empty when the incident location is unknown. referencePoint {lat, lon, level, name} is a display reference only: a fixed point in the named city (GeoNames), region (its administrative seat), sea or country (Natural Earth label point), derived at build time. It is not a geolocation, not an estimate of the incident location and may change when the dossier's place becomes more precise: reference point; incident location unknown.",
 "detailsNote": "media, operationalEffects, followUp and archiveEntity are editorial, source-indexed additions. Media is publisher-link only, has its own evidence status and never establishes drone presence or attribution. Debunked original-media links are removed; archived revisions omit media references. archivePattern is computed from mapped published event records at generated time, not a worldwide incident count. Null asOf means not established; publication time is not substituted.",
 "dataset": {
  "doi": "10.5281/zenodo.23345422",
  "url": "https://doi.org/10.5281/zenodo.23345422",
  "note": "Citable weekly snapshot (CSV + JSON) archived on Zenodo; this DOI always resolves to the latest version."
 },
 "howToCite": "Cite the dossier URL and revision, e.g. DroneLedger, “Wine Trader hit off Romania; president says drones struck the ship”, dossier wine-trader-fire-off-romania-2026-10-15, revision 4, updated 2026-10-15. https://droneincidents.com/incident/wine-trader-fire-off-romania-2026-10-15/",
 "incident": {
  "id": "arlanda-airport-alarm-2024-09-09",
  "title": "Unresolved drone alarm temporarily closes Stockholm Arlanda Airport",
  "place": "Sigtuna, Stockholm County",
  "country": "Sweden",
  "countryCode": "SE",
  "date": "2024-09-09",
  "dateKind": "event",
  "scope": "single",
  "category": "airport",
  "droneStatus": "inconclusive",
  "impactStatus": "confirmed",
  "attributionStatus": "none",
  "lat": 59.62,
  "lon": 17.72,
  "locationPrecision": "region",
  "summary": "A suspected-drone alarm interrupted flights at Stockholm Arlanda Airport overnight on 9 September 2024. Police later closed the investigations without establishing whether drones were present.",
  "impact": "SVT reports closure around 02:00 and reopening at 03:30 local time, with five flights affected. TV 4 describes observations around 01:00 followed by immediate closure, also giving 03:30 reopening. The start time and diversion count differ; no exact duration is asserted.",
  "evidence": "The airport operator Swedavia separately confirms operational recovery through TV 4. Police directly tell SVT that the investigations lack a basis to continue; SVT says object identity remains unclear. The replacement follow-up supports inconclusive, not a proven star, aircraft or hoax. Multiple articles repeating police do not independently identify a drone.",
  "unknown": "This dossier concerns the first overnight closure, not subsequent alarms on later evenings. Drone identity, count, operator and motive remain unresolved. The displayed point represents Sigtuna municipality, not an airport or drone coordinate.",
  "attribution": "No operator or responsible organisation established by these sources; no criminal charge or conviction is asserted.",
  "sources": [
   {
    "label": "SVT: Arlanda closure; article updated16September",
    "url": "https://www.svt.se/nyheter/lokalt/stockholm/arlanda-stangs-flygplan-dirigeras-om-till-skavsta",
    "published": "2024-09-09",
    "family": "svt",
    "publishedAt": "2024-09-09T03:11:00+02:00"
   },
   {
    "label": "TV4: alarm and airport operator account",
    "url": "https://www.tv4.se/artikel/6Se0MhOJbAXegXct99JZ57/all-flygtrafik-stoppades-pa-arlanda-i-natt",
    "published": "2024-09-09",
    "family": "tv4"
   },
   {
    "label": "SVT: all Arlanda investigations closed; police directly interviewed",
    "url": "https://www.svt.se/nyheter/lokalt/stockholm/samtliga-utredningar-om-dronarlarm-vid-arlanda-nedlagda",
    "published": "2024-09-20",
    "family": "svt",
    "publishedAt": "2024-09-20T10:37:00+02:00"
   }
  ],
  "timeline": [
   {
    "date": "2024-09-09",
    "text": "A reported sighting or alarm led to the documented airport restriction; see the source-bound claims and uncertainty below.",
    "source": 0
   }
  ],
  "droneStatusSources": [
   0,
   2
  ],
  "impactStatusSources": [
   0,
   1
  ],
  "attributionSources": [],
  "droneTypes": [],
  "claims": [
   {
    "id": "reopening",
    "axis": "impact",
    "statement": "SVT reports reopening at03:30 local time.",
    "quote": "03.30 kunde Arlanda öppna igen.",
    "claimant": "Airport operations reported by SVT",
    "originId": "arlanda-operation-20240909",
    "relay": "relayed",
    "assessment": "supports",
    "note": "Literal short passage checked in the original source; no independent confirmation inferred from republication.",
    "sourceIndex": 0,
    "quoteCheckedAt": "2026-10-15",
    "quoteTranslation": {}
   },
   {
    "id": "operator-normal",
    "axis": "impact",
    "statement": "Swedavia says normal traffic resumed without daytime delays.",
    "quote": "Enligt Swedavia ska det här inte leda till några förseningar under dagen",
    "claimant": "Swedavia",
    "originId": "swedavia-20240909",
    "relay": "relayed",
    "assessment": "supports",
    "note": "Literal short passage checked in the original source; no independent confirmation inferred from republication.",
    "sourceIndex": 1,
    "quoteCheckedAt": "2026-10-15",
    "quoteTranslation": {}
   },
   {
    "id": "police-no-basis",
    "axis": "drone",
    "statement": "Police say there is no basis to continue the investigation.",
    "quote": "Det finns helt enkelt inget att ta på, inget vi kan jobba vidare med",
    "claimant": "Swedish Police speaking directly to SVT",
    "originId": "swedish-police-arlanda-202409",
    "relay": "relayed",
    "assessment": "context",
    "note": "Literal short passage checked in the original source; no independent confirmation inferred from republication.",
    "sourceIndex": 2,
    "quoteCheckedAt": "2026-10-15",
    "quoteTranslation": {}
   }
  ],
  "review": "editor",
  "checkedAt": "2026-10-15",
  "autoCheckedAt": null,
  "updatedAt": "2026-10-15",
  "revision": 1,
  "series": [],
  "windowStart": null,
  "windowEnd": null,
  "windowBasis": null,
  "assessment": null,
  "outcome": [],
  "assessment_scale_version": null,
  "assessment_operator_subject": null,
  "assessment_operator_level": null,
  "assessment_operator_range_low": null,
  "assessment_operator_range_high": null,
  "assessment_target_subject": null,
  "assessment_target_level": null,
  "assessment_target_range_low": null,
  "assessment_target_range_high": null,
  "assessment_droneType_subject": null,
  "assessment_droneType_level": null,
  "assessment_droneType_range_low": null,
  "assessment_droneType_range_high": null,
  "media": [],
  "operationalEffects": [],
  "followUp": [],
  "archiveEntity": {
   "key": "stockholm-arlanda-airport",
   "kind": "airport",
   "label": "Stockholm Arlanda Airport",
   "sourceIndex": 0
  },
  "namedLocation": null,
  "publisherMedia": [],
  "archivePattern": {
   "asOf": "2026-10-15T21:51:35+00:00",
   "entityKey": "stockholm-arlanda-airport",
   "windows": [
    {
     "days": 30,
     "records": []
    },
    {
     "days": 90,
     "records": []
    }
   ],
   "note": "Only published archive records with an editorial entity mapping; unassigned records excluded. Not all real-world incidents or a common cause. No same-day matching."
  },
  "impactReports": [],
  "corroboration": "curated",
  "interceptionReported": {
   "evidenceState": "reported",
   "note": "Official aggregate claims, not independently verified kills. Parts are included only when explicitly sourced and sum to the reported total. Catalogue countermeasures are not incident evidence.",
   "counts": []
  },
  "referencePoint": null,
  "labels": {
   "category": "Airport disruption",
   "droneStatus": "Inconclusive",
   "impactStatus": "Confirmed",
   "attributionStatus": "Not established"
  },
  "url": "https://droneincidents.com/incident/arlanda-airport-alarm-2024-09-09/",
  "citation": "DroneLedger, “Unresolved drone alarm temporarily closes Stockholm Arlanda Airport”, dossier arlanda-airport-alarm-2024-09-09, revision 1, updated 2026-10-15. https://droneincidents.com/incident/arlanda-airport-alarm-2024-09-09/",
  "history": [
   {
    "revision": 1,
    "date": "2026-10-15",
    "at": "2026-10-15T19:30:46.072+00:00",
    "note": "Curated dossier created after checking the cited sources line by line."
   }
  ]
 }
}