DroneLedger

Airport disruption

Unresolved drone alarm temporarily closes Stockholm Arlanda Airport

Sigtuna, Stockholm County · 09 Sep 2024 · event date · approximate location

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. [1][2][3]

Drone presence remains inconclusive. The consequences are established. The operator is not established.

Drone presenceInconclusive[1][3]
ImpactConfirmed[1][2]
AttributionNot established

DroneLedger editorial team, publisher and editor responsible for this project.

AI-assisted editorial source review. This label records the editorial workflow, not a personal check of every source or sentence. Method and corrections

3 source families · a count of sources is not a verification score

AI-assisted editorial source review · 03 Nov 2026 · Dossier updated 03 Nov 2026

You are viewing revision 4 as published on 03 Nov 2026. The dossier text, evidence states, claims and sources of this revision are fixed; catalogue context such as cost estimates is not shown here. View the current version

What do we know now?

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. In September 2025, airport operator Swedavia told Mitt i that it had drone detection systems; that later statement did not establish what was seen during the 2024 alarm.

Facts at a glance
Drone type
  • No named drone type is recorded in this dossier.
Effects
  • According to SVT, citing Airport operations, Reopening was reported at 03:30 local time
  • According to tv4.se, citing Swedavia, Swedavia says normal traffic resumed without daytime delays
Who reported what
  • SVT [1 · 3]: Assessment of drone involvement; reported outcome
  • tv4.se: Reported outcome
Source families
  • 3 source families are recorded; republication is not independent confirmation

Further details are not known from the cited sources.

Timeline

Three clocks, one reading line

Shared calendar-day axis, from left to right. Bars mark days or reporting windows, not durations. Publication and revision clocks are not event clocks. Missing clocks remain unknown; the table gives all available precision and source links. The plot follows recorded calendar dates; time zones may differ. It establishes neither within-day order nor causality.

Three clocks, one reading line
TrackRecorded date / time
1 · Event
  • · Calendar day; time unknown
2 · Source publication
3 · Dossier revisions

What remains uncertain?

  • Was a drone established? A published investigation or identification could resolve this.
  • Who operated it, and why? An attributed investigation finding is missing.
Check the evidence
Source passage
  • Airport operations reported by SVT · “03.30 kunde Arlanda öppna igen.” SVT
  • Swedavia · “Enligt Swedavia ska det här inte leda till några förseningar under dagen” tv4.se
  • Swedish Police speaking directly to SVT · “Det finns helt enkelt inget att ta på, inget vi kan jobba vidare med” SVT
  • Swedavia, quoted by Mitt i · “har system för detektering av drönare” mitti.se

Claims and evidence

5 sources · 4 original statements

Sources that repeat the same original statement count once: a number of articles is not a number of independent confirmations.

ClaimOriginal sourceAssessment
Impact

SVT reports reopening at 03:30 local time.

[1]
Source passage
“03.30 kunde Arlanda öppna igen.”

Passage checked word for word against the source on 15 Oct 2026.

Airport operations reported by SVT via SVTSupports the report

Literal short passage checked in the original source; no independent confirmation inferred from republication.

Impact

Swedavia says normal traffic resumed without daytime delays.

[2]
Source passage
“Enligt Swedavia ska det här inte leda till några förseningar under dagen”

Passage checked word for word against the source on 15 Oct 2026.

Swedavia via TV4Supports the report

Literal short passage checked in the original source; no independent confirmation inferred from republication.

Drone

Police say there is no basis to continue the investigation.

[3]
Source passage
“Det finns helt enkelt inget att ta på, inget vi kan jobba vidare med”

Passage checked word for word against the source on 03 Nov 2026.

Swedish Police speaking directly to SVT via SVTContext only

Literal short passage checked in the original source; no independent confirmation inferred from republication.

Context

The airport operator described a later detection-system response.

[5]
Source passage
“har system för detektering av drönare”

Passage checked word for word against the source on 03 Nov 2026.

Swedavia, quoted by Mitt i via Mitt iSupports the report

Distinct dated original contribution; other reports sharing this origin are not independent corroboration.

Source genealogy

Grouped by recorded original statement, not by publisher. Unmapped sources have unknown dependency; linked statements may also share an earlier origin. This is not an independence score.

  1. Airport operations reported by SVT
    • SVT: Arlanda closure; article updated16September [1] · Relayed statement
  2. Swedavia
    • TV4: alarm and airport operator account [2] · Relayed statement
  3. Swedish Police speaking directly to SVT
    • SVT: all Arlanda investigations closed; police directly interviewed [3] · Relayed statement
  4. Swedavia, quoted by Mitt i
    • Mitt i: later written airport-operator response [5] · Relayed statement
  5. Unknown dependency
    • Arlanda: general response context [4]
Show source graph

Left: publishers; right: recorded original statement. Converging lines show shared origin, not publication order. Dashed nodes have unknown dependency.

Read with a source omitted

Reading aid: switch off a source or family to inspect the remaining visible support below. Evidence status is not recalculated.

How to read this table

Reading aid only. Switch off a source or its recorded family to inspect the remaining visible support for exact claim texts. Evidence status is not recalculated. Shared wording or a shared family does not prove independence. Only recorded links labelled “supports” count here; context and contradiction links are not support. The dossier itself is unchanged.

Claim → supporting sources · recorded links
ClaimSupporting sourcesVisible support
SVT reports reopening at 03:30 local time.[1]Support remains visible
Swedavia says normal traffic resumed without daytime delays.[2]Support remains visible
Police say there is no basis to continue the investigation.No supporting link recordedNo supporting link recorded
The airport operator described a later detection-system response.[5]Support remains visible

What we know

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.

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. Mitt i obtained a separate written airport-operator comment in September 2025. That is a different original contribution from the police interview about closing the investigations.

Data
No structured detail recorded
Hit / damaged · Fell near · Intercepted (claimed) · Human consequences

What remains 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. The later operator statement does not establish an installation date, system specification, effectiveness, or retrospective identification of the 2024 observations.

No operator or responsible organisation established by these sources; no criminal charge or conviction is asserted.

How the story changed

  1. A reported sighting or alarm led to the documented airport restriction; see the source-bound claims and uncertainty below. [1]

  2. Mitt i reports the airport operator saying it has drone detection systems. This later response is not identification of the objects reported in September 2024. [5]

Original sources (5)

3 source families · a count of sources is not a verification score

1SVT: Arlanda closure; article updated16September09 Sep 2024 · source family: SVT2TV4: alarm and airport operator account09 Sep 2024 · source family: TV43SVT: all Arlanda investigations closed; police directly interviewed20 Sep 2024 · source family: SVT4Arlanda: general response context13 Sep 2024 · source family: Svt5Mitt i: later written airport-operator response24 Sep 2025 · source family: Mitt i

Editorial changes

  1. Revision 4 · 03 Nov 2026Added the later September2025 airport-operator response, without retrospective drone confirmation or operational specifications.
  2. Revision 3 · 21 Oct 2026Typography: added missing spaces in dates and times (live-site audit 21 Oct 2026); no change of content.
  3. Revision 2 · 16 Oct 2026Added a sourced general counter-drone measure at this location.
  4. Revision 1 · 15 Oct 2026Curated dossier created after checking the cited sources line by line.

Cite this dossier

Permanent page · Revision 4

Chicago

DroneLedger editorial team. “Unresolved drone alarm temporarily closes Stockholm Arlanda Airport.” Dossier arlanda-airport-alarm-2024-09-09, revision 4, updated 03 Nov 2026. https://droneincidents.com/incident/arlanda-airport-alarm-2024-09-09/v4/

APA

DroneLedger editorial team. (03 Nov 2026). Unresolved drone alarm temporarily closes Stockholm Arlanda Airport (Dossier arlanda-airport-alarm-2024-09-09, revision 4). https://droneincidents.com/incident/arlanda-airport-alarm-2024-09-09/v4/

Cite the revision you used: later revisions may change evidence states.

Cite this version

Maker
DroneLedger editorial team
ID
arlanda-airport-alarm-2024-09-09
Revision or edition
4
Release
20261109T004623551925-8115f9
Publication date
03 Nov 2026
Accessed
09 Nov 2026
Permanent URL
https://droneincidents.com/incident/arlanda-airport-alarm-2024-09-09/v4/
Hashed file
JSON · SHA-256 0d938f8acd5acaa06b7b39fe892dd0a7c96f1e977c694d23bf33308a80082858

Dataset DOI for this exact version: Not yet in a DOI snapshot · DOI binding manifest

Dataset DOI (series, not this revision): 10.5281/zenodo.23345422

DroneLedger editorial team. Unresolved drone alarm temporarily closes Stockholm Arlanda Airport. ID arlanda-airport-alarm-2024-09-09; revision or edition 4; release 20261109T004623551925-8115f9; published 03 Nov 2026. https://droneincidents.com/incident/arlanda-airport-alarm-2024-09-09/v4/ Accessed 09 Nov 2026. SHA-256 0d938f8acd5acaa06b7b39fe892dd0a7c96f1e977c694d23bf33308a80082858 (https://droneincidents.com/data/citations/incident/arlanda-airport-alarm-2024-09-09/r4/0d938f8acd5acaa06b7b39fe892dd0a7c96f1e977c694d23bf33308a80082858/data.json). Not yet in a DOI snapshot.

Citation uses the English reference edition. Access date is the UTC date when this page was built; change it to your consultation date when reusing the citation.

Editorial pack (print / PDF)Follow this dossier (feed)Earlier versions