White Phosphorus Strike Over Yohmor Raises New Legal Concerns in Southern Lebanon

Last updated: 22 September 2026

Israel’s military continues to pound southern Lebanon as Hezbollah reports attacks on Israeli forces there [File: Karamallah Dahe/Reuters]

On March 9, 2026, Human Rights Watch published a report alleging that the Israeli military unlawfully used artillery-fired white phosphorus over the southern Lebanese town of Yohmor on March 3, during the latest escalation between Israel and Hezbollah. The article presents the incident as a serious case of potential indiscriminate attack, arguing that airburst white phosphorus was deployed over a residential area, endangering civilians and damaging homes and vehicles.

At the center of the report is the claim that the weapon was used in a way that violates the laws of war. White phosphorus is a chemical substance that ignites when exposed to oxygen and can set homes, farmland, cars, and other civilian objects on fire. It can be used for several military purposes, including marking, signaling, or creating smoke screens, but the article argues that airburst use over populated areas is unlawfully indiscriminate because it spreads burning material widely and makes it extremely difficult to protect civilians.

The report says researchers verified and geolocated eight images showing white phosphorus munitions bursting in the air above a residential neighborhood in Yohmor and emergency responders dealing with fires in at least two homes and one car. According to the article, one image posted on social media on the morning of March 3 showed at least two artillery-delivered munitions exploding over the town. The shape of the smoke cloud was described as consistent with the “knuckle” effect associated with M825-series 155mm artillery projectiles, which contain white phosphorus. This technical identification is important because it forms the basis of the report’s conclusion that the munitions were not generic explosive shells, but a specific incendiary weapon dispersing burning material over a broad area.

The article explains why the airburst method matters so much. In this form, the projectile bursts above ground and releases 116 burning felt wedges impregnated with white phosphorus over a radius estimated at 125 to 250 meters, depending on altitude and angle. That means the danger is not limited to one impact point. Instead, burning fragments can fall across rooftops, balconies, streets, and vehicles, making it much harder to distinguish between military and civilian objects in a populated place. The report argues that this wide dispersal is precisely why such use in residential areas fails the legal requirement to take all feasible precautions to avoid civilian harm.

The strike took place in the context of broader military operations and evacuation orders. The article notes that at 5:27 a.m. on March 3, Israel’s Arabic-language military spokesperson Avichay Adraee issued an order telling residents of Yohmor and 50 other villages and towns to leave immediately and move at least 1,000 meters away into open land. He repeated the order again at 12:12 p.m. the same day. The report does not say whether civilians were still present in the exact area at the moment the white phosphorus was fired, and it states that researchers had not independently verified injuries caused specifically by the weapon. Still, the article argues that evacuation warnings do not remove the legal obligation to avoid indiscriminate attacks on residential neighborhoods.

The report also describes the local aftermath in detail. Researchers verified and geolocated photographs posted later that day by the Civil Defense Team of the Islamic Health Committee in Yohmor, which is affiliated with Hezbollah. According to the article, these photographs showed emergency workers extinguishing fires on rooftops and in a vehicle, while smoke rose from balconies of a house. The geolocated fire sites were all within a radius of less than 160 meters, which the report says is consistent with the spread pattern expected from airburst white phosphorus. Based on that analysis, the article concludes that the fires were likely caused by burning felt wedges from the munitions rather than by an unrelated source.

A broader legal argument runs through the report. It says that under international humanitarian law, even when a weapon has lawful military uses, it becomes unlawful if employed in a manner that is indiscriminate in a place where civilians and civilian property are concentrated. In this case, the article argues that airburst white phosphorus over a residential neighborhood exposes anyone present to severe risk and cannot reliably be limited to a military objective. The report therefore treats the Yohmor incident not as a technical dispute over ammunition type, but as a question of whether an inherently wide-area incendiary effect was unleashed over homes.

The health effects described in the article help explain the severity of those concerns. White phosphorus can cause death, deep burns, and injuries that continue to worsen because the substance reignites when exposed to air unless fully deprived of oxygen. The report says the chemical’s incendiary effects can lead to cruel injuries and lifelong suffering. That medical reality gives the legal issue a particularly urgent human dimension: the danger is not only that structures catch fire, but that people caught nearby may suffer devastating burns and long-term trauma even if they survive.

The article also places the incident in a wider historical pattern. It says researchers had previously documented the Israeli military’s widespread use of white phosphorus in southern Lebanon between October 2023 and May 2024, when the weapon’s use put civilians at grave risk and contributed to displacement from border communities. The Yohmor incident is therefore presented not as an isolated episode, but as part of a recurring practice that rights groups say has already raised serious legal and humanitarian concerns in the past.

Another key part of the report is the surrounding humanitarian context in Lebanon. The article says that since the renewed escalation of hostilities between Israel and Hezbollah on March 2, at least 217 people had been killed in Lebanon by March 6, according to the Lebanese health ministry. A later update added that the death toll had risen to 394 as of March 8. The report also says hundreds of thousands of people have been displaced. In that environment, any use of incendiary weapons over residential areas carries heightened significance because civilian communities are already under intense pressure from repeated strikes, displacement orders, and uncertainty over where safety can still be found.

The article links the white phosphorus strike to Israel’s wider displacement policy in Lebanon. It says the Israeli military issued displacement orders for the entire population south of the Litani River and for all residents of Beirut’s southern suburbs, affecting very large civilian populations. The report argues that the sweeping scale of these orders raises concerns that their purpose may go beyond civilian protection and instead contribute to panic and large-scale movement. In that setting, the use of white phosphorus over a village like Yohmor is presented as part of a broader pattern in which civilian areas are being subjected to measures that may amount to unlawful forced displacement.

The legal debate also extends to the international regulation of incendiary weapons more generally. The article notes that Protocol III of the Convention on Conventional Weapons is the only binding international instrument specifically addressing incendiary weapons. Lebanon is a party to the protocol, while Israel is not. The report argues that the treaty has significant loopholes: it excludes some multipurpose munitions such as those containing white phosphorus, and it imposes weaker rules on ground-launched incendiary weapons than on airdropped ones, even though both can cause similar harm in civilian areas. By raising this point, the article suggests that the Yohmor incident is not only a case-specific controversy but also part of a longer debate about whether international law sufficiently protects civilians from incendiary weapons.

Another notable element is the emphasis on alternatives. The report says there are smoke-shell substitutes to white phosphorus, including the M150 smoke projectile, and notes that Israeli forces have used such alternatives in the past as obscurants. This detail strengthens the article’s broader claim that the use of white phosphorus in a populated setting was not militarily unavoidable. If less harmful alternatives exist and have already been used, then the case for continuing to deploy incendiary white phosphorus over residential areas becomes weaker both legally and ethically.

The article ends with a series of recommendations. It calls for Israel to immediately stop using airburst artillery-delivered white phosphorus in populated areas. It also urges countries supplying Israel with weapons — including the United States, the United Kingdom, and Germany — to suspend military assistance and arms sales if such practices continue. In addition, the report says Lebanon’s judicial authorities should investigate serious international crimes and that Lebanon should join the International Criminal Court and accept its jurisdiction retroactively to cover crimes committed since at least October 7, 2023. These proposals show that the article is framed not just as documentation, but as an attempt to push for legal and diplomatic consequences.

Taken together, the report presents the Yohmor strike as a significant test case in the current Israel-Lebanon conflict. It argues that verifiable visual evidence, fire damage, weapon analysis, and the residential setting all point toward unlawful use of an incendiary weapon in a civilian area. The article’s broader message is that the issue is not merely about one weapon or one village, but about the protection of civilians in a war where displacement, destruction, and fear are already spreading rapidly across southern Lebanon.

Conclusion

The report presents the Yohmor incident as a serious example of how incendiary weapons can place civilians and civilian property at risk when used over populated areas. Its central argument is that the weapon’s wide-area airburst effects make such use unlawfully indiscriminate, especially in an already heavily displaced and embattled region.

More broadly, the case is drawing attention because it connects immediate battlefield conduct with larger questions of civilian protection, forced displacement, and the adequacy of international law on incendiary weapons. In that context, the article suggests that the Yohmor strike is not only a local episode, but part of a wider debate over accountability and the rules governing modern warfare in southern Lebanon.