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Signal
Submitted
Feb 14, 2026, 12:22 UTC
On June 13, 2023, strong GPS jamming was detected near Bornholm during the Folkemødet political event, likely caused by a state actor, possibly Russian vessels near Bornholm in the Baltic Sea.
During the annual Folkemødet political festival held on Bornholm on June 13, 2023, significant and very strong GPS signal jamming was recorded over the island and the Baltic Sea region. The jamming was notably closer to the island at ground level compared to previous years when jamming was detected only at higher altitudes above the sea. Søren Reime Larsen, a GPS interference expert from DTU Space, highlighted the jamming involved multiple active jammers and was powerful enough to disrupt critical infrastructure systems reliant on GPS timing and location data, such as mobile networks, navigation systems, electronic payments, financial trading, and the power grid. Given the scale and intensity of the interference, the source is almost certainly a state actor. Unlike prior attacks traced to Russian forces in Kaliningrad, the current jamming appears to come from vessels north of Bornholm in the Baltic Sea, due to radar line-of-sight constraints. The incident coincided with the presence of Denmark's Prime Minister Mette Frederiksen and other top politicians on Bornholm attending the Folkemødet. This attack underscores the growing hybrid warfare threat in the region involving advanced electronic interference targeting critical civilian infrastructure.
Confidence: High
The report explicitly describes GPS jamming attacks affecting Bornholm linked to foreign state actors, consistent with hostile hybrid warfare activity. No defense or countermeasures are described, so only aggressor classification applies.
Source URL
https://bt.dk/udland/bornholm-ramt-af-meget-kraftig-gps-jamming-under-folkemoedet-kan-naesten-kun-vaere
Published as a hybrid-warfare signal with a public source and reviewer-approved assessment bands. See the methodology for how records are assessed.
{
"id": "42510a04-4cda-44c3-be64-42bcf03a0920",
"url": "https://bt.dk/udland/bornholm-ramt-af-meget-kraftig-gps-jamming-under-folkemoedet-kan-naesten-kun-vaere",
"source": "admin_quick",
"status": "approved",
"category": "Intelligence & Espionage",
"subcategory": "Signals/Technical Intelligence (SIGINT/TECHINT)",
"incident_type": "GPS jamming, spoofing, EW",
"country": "Denmark",
"source_reliability": "A",
"info_credibility": "2",
"tags": [
"GPS jamming",
"Bornholm",
"DTU Space",
"Folkemødet",
"Russia Kaliningrad",
"electronic warfare",
"hybrid warfare",
"Denmark"
],
"nodes": [],
"countries": [
"Denmark"
],
"where_text": "Land",
"headline": "Bornholm hit by very strong GPS jamming during Folkemødet – almost certainly a state actor",
"description": "During the Folkemødet political festival on Bornholm on June 13, 2023, very strong GPS jamming signals were detected over Bornholm and parts of the Baltic Sea. The jamming was unusually close to Bornholm, impacting GPS signals at ground level and in the surrounding region, unlike previous years when jamming was detected only at higher altitudes. Danish expert Søren Reime Larsen from DTU Space assessed the jamming as very powerful and possibly involving multiple jamming devices simultaneously. Given the strength and nature of the jamming, he stated it almost certainly originated from a state actor, with suspicion focused on Russian sources operating from vessels near Bornholm rather than from Kaliningrad, due to line-of-sight limitations at ground level. The jamming posed risks to critical infrastructure dependent on GPS synchronization, including mobile communications, navigation, financial transactions, and power grids. The incident coincided with the presence of Danish Prime Minister Mette Frederiksen and many politicians attending the event. There were previous similar jamming attacks in the region impacting Bornholm and southern Sweden, notably in spring 2022, attributed to Russia from Kaliningrad.",
"summary_short": "On June 13, 2023, strong GPS jamming was detected near Bornholm during the Folkemødet political event, likely caused by a state actor, possibly Russian vessels near Bornholm in the Baltic Sea.",
"summary_extended": "During the annual Folkemødet political festival held on Bornholm on June 13, 2023, significant and very strong GPS signal jamming was recorded over the island and the Baltic Sea region. The jamming was notably closer to the island at ground level compared to previous years when jamming was detected only at higher altitudes above the sea. Søren Reime Larsen, a GPS interference expert from DTU Space, highlighted the jamming involved multiple active jammers and was powerful enough to disrupt critical infrastructure systems reliant on GPS timing and location data, such as mobile networks, navigation systems, electronic payments, financial trading, and the power grid. Given the scale and intensity of the interference, the source is almost certainly a state actor. Unlike prior attacks traced to Russian forces in Kaliningrad, the current jamming appears to come from vessels north of Bornholm in the Baltic Sea, due to radar line-of-sight constraints. The incident coincided with the presence of Denmark's Prime Minister Mette Frederiksen and other top politicians on Bornholm attending the Folkemødet. This attack underscores the growing hybrid warfare threat in the region involving advanced electronic interference targeting critical civilian infrastructure.",
"actor_primary": "Russian forces or operatives on vessels north of Bornholm",
"target_primary": null,
"location_text": "Bornholm",
"location_region": "Bornholm",
"location_coordinates_lat": 55.1043,
"location_coordinates_lon": 15.0734,
"location_precision": "Approximate",
"is_aggressor_signal": true,
"signal_type": "HYBRID_SIGNAL",
"is_hybrid_war_signal": true,
"classification_complete": true,
"hybrid_signal_complete": true,
"classification_confidence": "High",
"classification_rationale": "The report explicitly describes GPS jamming attacks affecting Bornholm linked to foreign state actors, consistent with hostile hybrid warfare activity. No defense or countermeasures are described, so only aggressor classification applies.",
"event_time_utc": "2023-06-13T00:00:00.000Z",
"end_time_utc": null,
"event_time_confidence": "pm24h",
"created_at": "2026-02-14T12:22:51.060Z",
"updated_at": "2026-11-08T20:21:12.514Z",
"reliability_band": "strong",
"location_precision_band": "approximate",
"time_precision_band": "within_24h",
"severity_band": "moderate",
"attribution_confidence_band": "high",
"attribution_basis": "single_source"
}Source reliability
A
Info credibility
2
Event time
Jun 13, 2023, 00:00 UTC
Event time confidence
pm24h
Location
Bornholm
Region
Bornholm
Primary actor
Russian forces or operatives on vessels north of Bornholm
Country
Denmark
Countries
Denmark
Tags
GPS jamming, Bornholm, DTU Space, Folkemødet, Russia Kaliningrad, electronic warfare, hybrid warfare, Denmark
Signal
Submitted
Feb 14, 2026, 12:22 UTC
On June 13, 2023, strong GPS jamming was detected near Bornholm during the Folkemødet political event, likely caused by a state actor, possibly Russian vessels near Bornholm in the Baltic Sea.
During the annual Folkemødet political festival held on Bornholm on June 13, 2023, significant and very strong GPS signal jamming was recorded over the island and the Baltic Sea region. The jamming was notably closer to the island at ground level compared to previous years when jamming was detected only at higher altitudes above the sea. Søren Reime Larsen, a GPS interference expert from DTU Space, highlighted the jamming involved multiple active jammers and was powerful enough to disrupt critical infrastructure systems reliant on GPS timing and location data, such as mobile networks, navigation systems, electronic payments, financial trading, and the power grid. Given the scale and intensity of the interference, the source is almost certainly a state actor. Unlike prior attacks traced to Russian forces in Kaliningrad, the current jamming appears to come from vessels north of Bornholm in the Baltic Sea, due to radar line-of-sight constraints. The incident coincided with the presence of Denmark's Prime Minister Mette Frederiksen and other top politicians on Bornholm attending the Folkemødet. This attack underscores the growing hybrid warfare threat in the region involving advanced electronic interference targeting critical civilian infrastructure.
Confidence: High
The report explicitly describes GPS jamming attacks affecting Bornholm linked to foreign state actors, consistent with hostile hybrid warfare activity. No defense or countermeasures are described, so only aggressor classification applies.
Source URL
https://bt.dk/udland/bornholm-ramt-af-meget-kraftig-gps-jamming-under-folkemoedet-kan-naesten-kun-vaere
Published as a hybrid-warfare signal with a public source and reviewer-approved assessment bands. See the methodology for how records are assessed.
{
"id": "42510a04-4cda-44c3-be64-42bcf03a0920",
"url": "https://bt.dk/udland/bornholm-ramt-af-meget-kraftig-gps-jamming-under-folkemoedet-kan-naesten-kun-vaere",
"source": "admin_quick",
"status": "approved",
"category": "Intelligence & Espionage",
"subcategory": "Signals/Technical Intelligence (SIGINT/TECHINT)",
"incident_type": "GPS jamming, spoofing, EW",
"country": "Denmark",
"source_reliability": "A",
"info_credibility": "2",
"tags": [
"GPS jamming",
"Bornholm",
"DTU Space",
"Folkemødet",
"Russia Kaliningrad",
"electronic warfare",
"hybrid warfare",
"Denmark"
],
"nodes": [],
"countries": [
"Denmark"
],
"where_text": "Land",
"headline": "Bornholm hit by very strong GPS jamming during Folkemødet – almost certainly a state actor",
"description": "During the Folkemødet political festival on Bornholm on June 13, 2023, very strong GPS jamming signals were detected over Bornholm and parts of the Baltic Sea. The jamming was unusually close to Bornholm, impacting GPS signals at ground level and in the surrounding region, unlike previous years when jamming was detected only at higher altitudes. Danish expert Søren Reime Larsen from DTU Space assessed the jamming as very powerful and possibly involving multiple jamming devices simultaneously. Given the strength and nature of the jamming, he stated it almost certainly originated from a state actor, with suspicion focused on Russian sources operating from vessels near Bornholm rather than from Kaliningrad, due to line-of-sight limitations at ground level. The jamming posed risks to critical infrastructure dependent on GPS synchronization, including mobile communications, navigation, financial transactions, and power grids. The incident coincided with the presence of Danish Prime Minister Mette Frederiksen and many politicians attending the event. There were previous similar jamming attacks in the region impacting Bornholm and southern Sweden, notably in spring 2022, attributed to Russia from Kaliningrad.",
"summary_short": "On June 13, 2023, strong GPS jamming was detected near Bornholm during the Folkemødet political event, likely caused by a state actor, possibly Russian vessels near Bornholm in the Baltic Sea.",
"summary_extended": "During the annual Folkemødet political festival held on Bornholm on June 13, 2023, significant and very strong GPS signal jamming was recorded over the island and the Baltic Sea region. The jamming was notably closer to the island at ground level compared to previous years when jamming was detected only at higher altitudes above the sea. Søren Reime Larsen, a GPS interference expert from DTU Space, highlighted the jamming involved multiple active jammers and was powerful enough to disrupt critical infrastructure systems reliant on GPS timing and location data, such as mobile networks, navigation systems, electronic payments, financial trading, and the power grid. Given the scale and intensity of the interference, the source is almost certainly a state actor. Unlike prior attacks traced to Russian forces in Kaliningrad, the current jamming appears to come from vessels north of Bornholm in the Baltic Sea, due to radar line-of-sight constraints. The incident coincided with the presence of Denmark's Prime Minister Mette Frederiksen and other top politicians on Bornholm attending the Folkemødet. This attack underscores the growing hybrid warfare threat in the region involving advanced electronic interference targeting critical civilian infrastructure.",
"actor_primary": "Russian forces or operatives on vessels north of Bornholm",
"target_primary": null,
"location_text": "Bornholm",
"location_region": "Bornholm",
"location_coordinates_lat": 55.1043,
"location_coordinates_lon": 15.0734,
"location_precision": "Approximate",
"is_aggressor_signal": true,
"signal_type": "HYBRID_SIGNAL",
"is_hybrid_war_signal": true,
"classification_complete": true,
"hybrid_signal_complete": true,
"classification_confidence": "High",
"classification_rationale": "The report explicitly describes GPS jamming attacks affecting Bornholm linked to foreign state actors, consistent with hostile hybrid warfare activity. No defense or countermeasures are described, so only aggressor classification applies.",
"event_time_utc": "2023-06-13T00:00:00.000Z",
"end_time_utc": null,
"event_time_confidence": "pm24h",
"created_at": "2026-02-14T12:22:51.060Z",
"updated_at": "2026-11-08T20:21:12.514Z",
"reliability_band": "strong",
"location_precision_band": "approximate",
"time_precision_band": "within_24h",
"severity_band": "moderate",
"attribution_confidence_band": "high",
"attribution_basis": "single_source"
}Source reliability
A
Info credibility
2
Event time
Jun 13, 2023, 00:00 UTC
Event time confidence
pm24h
Location
Bornholm
Region
Bornholm
Primary actor
Russian forces or operatives on vessels north of Bornholm
Country
Denmark
Countries
Denmark
Tags
GPS jamming, Bornholm, DTU Space, Folkemødet, Russia Kaliningrad, electronic warfare, hybrid warfare, Denmark