The United States’ 3 January operation in Caracas that resulted in the capture of Venezuelan President Nicolás Maduro has prompted a second, more opaque debate: whether US forces used a directed-energy or acoustic system to disable Venezuelan defenders during the raid.

What is established, from reporting and official statements, is that the operation removed Maduro from power and that Venezuelan officials say at least 100 members of the security forces were killed. Venezuela’s interior minister, Diosdado Cabello, said Maduro and his wife, Cilia Flores, were injured during the raid. Acting President Delcy Rodríguez declared a period of mourning for those killed. Reuters has also reported US officials portraying the raid as a signal to Beijing to curtail strategic activity in the Western Hemisphere, arguing that Chinese- and Russian-supplied air defences in Venezuela were disabled quickly.

In the UK, the House of Commons Library briefing published on 6 January said the UK Government was not involved in the operation, while noting that legal scholars and politicians have questioned its legality under international law.

Alongside these confirmed elements sits a claim that has travelled rapidly online: that Venezuelan troops and Cuban personnel assigned to protect Maduro were incapacitated by a “sound-like” force that produced nosebleeds, vomiting blood and temporary immobility.

A widely circulated account, republished on social media by the White House press secretary, describes Venezuelan radar systems failing abruptly before drones appeared overhead, followed by helicopters inserting a small team of US troops. The account alleges that, after a short exchange of fire, the Americans deployed a device producing an “intense sound wave”, after which defenders began bleeding and could not stand. The report adds that the White House did not respond to questions about whether reposting the account amounted to verification.

That has not stopped speculation about what might plausibly fit the description. The reported sequence — electronics disruption followed by personnel incapacitation — has encouraged some analysts to argue that more than one capability may have been used, potentially combining counter-electronics systems with a separate anti-personnel effect.

For counter-electronics effects, a known research line is high-power microwave or electromagnetic pulse weapons intended to disable or disrupt electronics. The US “Counter-electronics High Power Microwave Advanced Missile Project” (CHAMP) is frequently cited in public discussions of this category, described as an air-launched system designed to incapacitate electronic systems via an electromagnetic pulse. The existence of such concepts does not prove they were used in Venezuela; it does, however, provide a framework for why there was a sudden radar and communications failure if a counter-electronics effect occurred.

The anti-personnel part of the claim is harder to square with known, openly described systems. “Long-range acoustic devices” (LRADs) are directional sound systems used for hailing and, controversially, crowd control. They can cause pain and hearing damage at high output, but public descriptions do not associate them with widespread bleeding.

Another openly described US programme is the Active Denial Technology, a millimetre-wave system designed to deter individuals by heating the skin surface, positioned by the US defence establishment as an intermediate, non-lethal option. Again, that mechanism is not usually linked with nosebleeds or vomiting blood.

A separate line of discussion points to microwaves not as an “audible” weapon but as a way of inducing auditory sensations inside the head. The microwave auditory effect — also known as the Frey effect — is a documented phenomenon in which pulsed radiofrequency energy can produce perceptions of clicking or buzzing without airborne sound. A peer-reviewed review has examined whether this effect could be “weaponised”, while noting the constraints involved and the gap between laboratory effects and operational use.

The Caracas allegation echoes, in a loose way, the long-running Havana syndrome debate, where some affected personnel reported hearing sounds and experiencing neurological symptoms, and where “directed energy” has been among the theories discussed in public. But Havana syndrome remains disputed, and US intelligence reviews have previously said there was no evidence tying most cases to a hostile energy weapon.

In practice, the symptoms described in the Venezuelan account — particularly blood vomiting and mass nosebleeds — would normally prompt scrutiny for alternative explanations: blast overpressure, shrapnel or blunt trauma, chemical irritants, or injuries sustained while seeking cover. Without medical documentation, imaging, or an independent incident investigation, attributing such effects to a “sonic” or “microwave” weapon remains conjecture.

The narrative has already been repurposed in wider geopolitical argument, notably claims that the raid demonstrates an insurmountable US advantage over Russia in any future conflict. That conclusion does not follow from publicly available evidence. What the episode does show is that the United States is prepared to use force in Venezuela and to frame it as strategic signalling, including towards China. Whether any new class of weapon was used — and if so, which — is not currently substantiated by independently verifiable detail.