# A foreign adversary attacked US personnel with a secret energy weapon and the government is hiding it

**No verdict.** The symptoms are real and often debilitating, and serious open questions remain: a 2020 National Academies panel called directed pulsed radiofrequency energy the most plausible mechanism for a core group of cases. But the specific claim rated here, that a hostile state fired an energy weapon and officials are covering it up, is not supported. The March 2023 Intelligence Community assessment judged it 'very unlikely' a foreign adversary was responsible, and 2024 NIH studies in JAMA found no consistent evidence of brain injury. The suffering is documented; the weapon and the cover-up are not.

Category: Government & Intelligence · Era: 2010s–2020s · First circulated: 2016 · Believed by: Belief is widespread among affected personnel and their advocates, and a bipartisan group of members of Congress has publicly disputed the intelligence community's skeptical conclusion. Some intelligence and defense officials continue to argue privately that a directed-energy attack has not been ruled out.
URL: https://theconspiratory.com/theory/havana-syndrome

## Summary
Beginning in late 2016, US diplomats and intelligence officers in Havana reported a frightening set of symptoms: a sudden sensation of pressure or piercing sound, followed by headaches, dizziness, ringing ears, and lasting cognitive problems. More than 1,000 of these 'anomalous health incidents' have since been reported worldwide. This case file separates two things that are often merged. The symptoms are real, sometimes disabling, and deserve to be taken seriously. The specific conspiracy claim, that a foreign adversary struck personnel with a secret microwave or directed-energy weapon and that the US government is concealing the true cause, is the claim rated here, and on the current record it is unproven: the March 2023 Intelligence Community assessment found a foreign adversary 'very unlikely', while a 2020 National Academies report and a number of unexplained cases keep the medical question genuinely open.

## The claim
That the illness known as Havana Syndrome was caused by a deliberate attack, most often alleged to be a Russian directed-energy or pulsed-microwave weapon, aimed at US diplomats and spies, and that the United States government knows this and is suppressing or downplaying the evidence to avoid a confrontation and to escape liability for failing to protect its people.

## Origin and timeline
- 2016: US Embassy personnel and CIA officers in Havana, Cuba begin reporting a sudden onset of strange sensations: a piercing noise, a feeling of pressure or vibration in the head, often seemingly directional, followed by headaches, nausea, dizziness, and cognitive difficulty. These become the first documented anomalous health incidents (AHIs).
- 2017-09: The State Department withdraws roughly half of its personnel from the US Embassy in Havana and warns Americans against travel to Cuba, citing the unexplained incidents. Cuba denies any involvement and denies knowledge of any weapon.
- 2018: US personnel at the consulate in Guangzhou, China report similar symptoms. Cases are subsequently reported by government personnel in other countries, broadening the phenomenon well beyond Cuba.
- 2020-12: A National Academies of Sciences, Engineering, and Medicine committee concludes that, among the mechanisms it considered, directed pulsed radiofrequency energy 'appears to be the most plausible mechanism' for the distinctive symptoms of a core group of cases, while stressing it could not identify a source or confirm an attack.
- 2021-10: President Biden signs the HAVANA Act into law (Public Law 117-46), authorizing the CIA, State Department, and other agencies to make financial payments to personnel who suffered qualifying brain injuries. The law passed both chambers of Congress with near-unanimous support.
- 2022-01: An interim Intelligence Community assessment finds that a majority of the roughly 1,000 reported cases can plausibly be explained by environmental factors, undiagnosed illness, or pre-existing conditions, but that a smaller set of cases cannot be easily explained and warrant continued investigation.
- 2022-02: The declassified findings of an IC Experts Panel are released, concluding that the symptoms are genuine and that pulsed electromagnetic energy, particularly in the radiofrequency range, plausibly explains the core characteristics of some cases, though significant information gaps remain.
- 2023-03: The Intelligence Community releases an updated assessment concluding it is 'very unlikely' that a foreign adversary is responsible for the incidents. Most participating agencies judge that available evidence does not implicate a hostile actor or a novel weapon.
- 2024-03: The National Institutes of Health publishes two studies in JAMA finding no significant evidence of MRI-detectable brain injury or consistent biological abnormalities in AHI patients compared with matched controls, while confirming that the patients reported real and often severe symptoms.

## The evidence, claim by claim
- Claim: The symptoms are real and serious, and a 2020 National Academies panel said a directed energy beam was the most plausible cause.
  Evidence: Both halves of this are essentially accurate, and they are the strongest part of the case. Personnel reported genuine, sometimes disabling illness, and the 2020 National Academies of Sciences report did conclude that, of the mechanisms it weighed, directed pulsed radiofrequency energy 'appears to be the most plausible mechanism' for the distinctive symptoms in a core group of cases. But the same report was explicit about its limits: it could not identify a device, a source, or an actor, and it noted that psychological and social factors and other medical conditions likely contributed to the broader set of reports. 'Most plausible mechanism' for a physical sensation is a long way from 'a foreign adversary fired a weapon', which the panel did not claim.
- Claim: This is really about Russia. A hostile intelligence service developed a microwave weapon and used it to target American spies and diplomats.
  Evidence: This is the heart of the conspiracy claim, and it is where the evidence runs out. Investigative journalists and some current and former officials have pointed to a Russian military intelligence (GRU) unit as a suspect, and the pattern of targeting intelligence officers struck many as deliberate. But the March 2023 Intelligence Community assessment, drawing on work by seven agencies, judged it 'very unlikely' that a foreign adversary was responsible, and found no credible evidence that any country has such a weapon or deployed one. Suspicion and circumstantial pattern-matching are not the same as proof, and no device, no defector, and no intercept confirming an attack has been made public.
- Claim: The 2024 NIH studies proving there was no brain injury show the government is covering up the real damage.
  Evidence: The NIH findings are frequently read backwards. The two 2024 studies in JAMA found no consistent MRI-detectable brain injury and no reliable biomarker of harm in AHI patients versus controls. Crucially, the researchers did not conclude that nothing happened to these people: they affirmed that the symptoms were real and that many patients were genuinely suffering, including some with functional neurological disorders, which are real, involuntary, and disabling. The absence of a visible lesion is evidence against a specific injury mechanism, not evidence of a cover-up. Some patients and clinicians criticized the study design, noting many were assessed long after onset, which is a fair methodological dispute, not proof of concealment.
- Claim: The government created a special compensation law, which proves officials privately believe personnel were attacked.
  Evidence: The HAVANA Act of 2021 is real and was passed almost unanimously, but it does not establish an attack. The law authorizes payments to personnel who suffered qualifying brain injuries in connection with hostile acts or designated incidents; it was a response to genuine, documented suffering and to a duty of care toward employees, not a finding that a specific weapon was used by a specific country. A government can compensate people for a harm whose cause it has not determined. Reading the statute as a confession conflates 'we owe these people support' with 'we know who attacked them', which the government's own later assessments do not say.

## Why people believe it
- The core experience is undeniable. Real people reported sudden, frightening sensations and were left with lasting headaches, dizziness, and cognitive problems. When the suffering is genuine, an explanation that names an external attacker can feel more respectful, and more bearable, than being told the cause is uncertain or partly psychological.
- Serious institutions gave the weapon hypothesis real oxygen. A 2020 National Academies panel called directed pulsed radiofrequency energy the most plausible mechanism for a core group of cases, and a declassified IC Experts Panel said pulsed electromagnetic energy plausibly explained some incidents. Believers are not clinging to a fringe idea; they are holding onto a hypothesis that credentialed bodies treated as live.
- The targets fit a story. Many early cases involved intelligence officers and diplomats, the exact people a hostile service would want to harm. That pattern makes a deliberate-attack narrative feel intuitive, even though a phenomenon that is first noticed and most intensively investigated among spies will naturally appear concentrated among spies.
- Officials shifted their stance over time, from alarm and staff withdrawals to a skeptical 'very unlikely' verdict. To someone who lived through the fear, that arc can look less like the evidence changing and more like the government walking back an inconvenient truth to avoid a confrontation with a nuclear-armed rival.
- Distrust of intelligence agencies is well earned. After documented episodes in which agencies did mislead the public, a flat official assurance that 'no adversary did this' lands on a public, and a workforce, already primed to suspect that the most alarming explanation is the one being buried.

## Open questions
- What caused the core group of unexplained cases? Both the 2020 National Academies report and the 2022 interim IC assessment acknowledged a subset of incidents that are not easily explained by environmental factors, known illness, or psychological causes. That residue is real and has never been fully resolved, which is precisely why the medical question stays open even as the attack-and-cover-up claim does not hold up.
- Is directed pulsed radiofrequency energy physically capable of producing these symptoms, and did anyone possess such a capability? The National Academies called the mechanism plausible in principle, but plausibility is not deployment. Whether any state actually built and used such a device remains unestablished, and the intelligence community's own agencies did not all reach the question with equal confidence.
- Why did agencies split? The March 2023 assessment reflected a range of views, with most agencies rating a foreign adversary 'very unlikely' but not all reaching that judgment with the same confidence. That internal disagreement, among people with access to classified evidence, is a legitimate reason for reasonable observers to withhold total certainty.
- Did the timing and clustering mean anything? Some clusters of cases coincided with the presence of senior officials or intelligence activity, which fed suspicion of targeting. Whether those coincidences reflect deliberate action, reporting and surveillance bias, or chance has not been settled on the public record.

## Latest developments
- 2026-07-29T00:00Z: The question reopened in 2026. A March 2026 CBS 60 Minutes report, part of a multiyear investigation with The Insider and Der Spiegel, described the suspected weapon in more detail and said US investigators had obtained a portable device built from Russian-origin components capable of emitting pulsed radiofrequency energy, again pointing to Russia's GRU Unit 29155; some current and former officials voiced higher confidence that a foreign actor was involved. This is contested investigative reporting, not an official finding: the intelligence community's 2023 'very unlikely' assessment has not been formally reversed, and the verdict is unchanged. (source: https://www.cbsnews.com/news/5-year-havana-syndrome-investigation-finds-new-evidence-of-who-might-be-responsible-60-minutes/)

## Sources
- Updated Assessment of Anomalous Health Incidents, Office of the Director of National Intelligence (National Intelligence Council) (2023): https://www.dni.gov/files/ODNI/documents/assessments/NIC-Unclassified-ICA-Updated-Assessment-AHI-March2023.pdf
- DNI Statement on the Intelligence Community Assessment on AHIs, Office of the Director of National Intelligence (2023): https://www.dni.gov/index.php/newsroom/reports-publications/reports-publications-2023/3673-dni-statement-on-the-intelligence-community-assessment-on-ahis
- An Assessment of Illness in U.S. Government Employees and Their Families at Overseas Embassies, National Academies of Sciences, Engineering, and Medicine (2020): https://nap.nationalacademies.org/catalog/25889/an-assessment-of-illness-in-us-government-employees-and-their-families-at-overseas-embassies
- Executive Summary: Report of the Intelligence Community Experts Panel on Anomalous Health Incidents (declassified), Office of the Director of National Intelligence (2022): https://www.odni.gov/files/ODNI/documents/assessments/2022_02_01_AHI_Executive_Summary_FINAL_Redacted.pdf
- Complementary Efforts on Anomalous Health Incidents (IC Experts Panel findings), Office of the Director of National Intelligence (2022): https://www.dni.gov/index.php/newsroom/reports-publications/reports-publications-2022/3591-complementary-efforts-on-anomalous-health-incidents
- S.1828 - HAVANA Act of 2021 (Public Law 117-46), U.S. Congress (Congress.gov, Library of Congress) (2021): https://www.congress.gov/bill/117th-congress/senate-bill/1828
- NIH studies find severe symptoms of 'Havana Syndrome,' but no evidence of MRI-detectable brain injury or biological abnormalities, National Institutes of Health (2024): https://www.nih.gov/news-events/news-releases/nih-studies-find-severe-symptoms-havana-syndrome-no-evidence-mri-detectable-brain-injury-or-biological-abnormalities
- Neuroimaging Findings in US Government Personnel and Their Family Members Involved in Anomalous Health Incidents, JAMA (Pierpaoli C, et al.) (2024): https://jamanetwork.com/journals/jama/fullarticle/2816532
- Havana Syndrome: Better Patient Communication and Monitoring of Key DOD Tasks Needed to Better Ensure Timely Treatment, U.S. Government Accountability Office (GAO-24-106593) (2024): https://www.gao.gov/products/gao-24-106593

Rated by The Conspiratory, a neutral, sourced encyclopedia of conspiracy theories. Full page: https://theconspiratory.com/theory/havana-syndrome