Yemen's Coastal War Has Displaced 130,000 People Since 1 September. On the 25th, the UN Declared It an Emergency in Somalia and Djibouti Too.

Abstract: An eighteen-hour Houthi offensive in early September 2026 captured the Yemeni port of Mokha and the islands of Perim, Zuqar and the Hanish group, completing the group's control of the Bab el-Mandeb Strait and the entire Yemeni Red Sea coastline. The military story was covered as a Middle East shipping and security crisis. The humanitarian story that followed it has become a Horn of Africa one. The International Organization for Migration said on 18 September that fighting had displaced 112,000 people inside Yemen; UNHCR said on 25 September that the toll had passed 130,000 since 1 September and could reach 230,000. Over the same period, more than 3,600 people crossed the strait to Djibouti, landing mainly at Obock, Khor Angar, Moulhoule and Godoria, while hundreds more reached Somaliland's Berbera and Puntland's Bosaso, arrivals still limited by rough seasonal seas that are expected to ease from mid-October. On 25 September, UNHCR declared a Level 1 emergency covering Yemen, Djibouti and Somalia together, its formal acknowledgment that a war on the Arabian Peninsula has become a displacement crisis on the African one. The declaration arrived with the agency's Djibouti reception operation only fifteen percent funded against a revised $13.5 million appeal, and its Yemen operation eighteen percent funded against a further $14 million request.

An eighteen-hour offensive that closed a strait

The chain of events began with a rapid Houthi military campaign, not a refugee crisis. In an offensive that outside observers described as taking roughly eighteen hours, Houthi forces swept along Yemen's western coastline in early September, capturing the port city of Mokha and the islands of Perim (also called Mayyun), Zuqar and the Hanish group. Recapturing Perim on 11 September gave the group physical control of both shores commanding the Bab el-Mandeb Strait, and taking the Hanish Islands completed its hold over the entirety of Yemen's Red Sea coast, positioning Houthi forces roughly twenty kilometres from the African coastline at the strait's narrowest point. The operation was reported chiefly as a maritime security and shipping story, since it gave the group effective leverage over one of the world's most heavily trafficked chokepoints. What followed it, and what has drawn far less attention, is the civilian displacement the same offensive produced on the ground it fought over.

From 112,000 to 130,000 in a week

The displacement figures moved quickly and kept moving. The International Organization for Migration said on 18 September that fighting along the coast had displaced 112,000 people inside Yemen since the offensive began. A week later, on 25 September, UNHCR said the figure had passed 130,000 and warned it could swell to more than 230,000 if the fighting continued, a projection built on the same dynamic that has driven the toll upward so far: sea conditions in the Gulf of Aden and the Bab el-Mandeb approach are expected to improve from mid-October, which aid officials say would make the crossing to Djibouti and the Somali coast easier rather than harder, potentially accelerating departures rather than slowing them. Neither figure distinguishes cleanly between people displaced within Yemen and those who have already left it; both describe a population still being counted as it moves.

Djibouti's count: 3,600 arrivals and a camp "reaching capacity"

Djibouti absorbed the largest share of those who crossed the strait. UNHCR and OCHA recorded 3,601 new arrivals from Yemen in Djibouti as of 18 September, landing mainly at Obock, Khor Angar, Moulhoule and Godoria on the country's northern coast, with more than sixty percent of arrivals women, children and older people. Sandrine Desamours, UNHCR's Representative in Djibouti, said new arrivals at reception centres "recount fleeing sudden bombardment, shelling, gunfire and having to fear for their lives; mothers quickly gathering their children and whatever they can." Djibouti's government responded by having Prime Minister Abdoulkader Kamil Mohamed chair a coordination meeting establishing a unified system for registering, housing and assisting arrivals, with the National Office for Assistance to Refugees and Disaster-Stricken People (ONARS) leading registration at the Markazi site and the Djiboutian Coast Guard conducting search-and-rescue operations for boats in distress. Addressing the UN General Assembly the same week, Foreign Minister Abdoulkader Houssein Omar said the Markazi camp was approaching capacity and that "Djibouti alone can't meet the growing needs for shelter, food and essential services," an appeal for international support from a government that has already stood up its own national emergency response mechanism.

Somaliland and Puntland: the arrivals a Yemen story usually leaves out

Djibouti has not been the only Horn of Africa destination. Authorities in Somaliland and Puntland have reported a smaller but growing number of arrivals from Yemen at their own port towns, Berbera and Bosaso, alongside returning Somali migrants who had been living in Yemen. Numbers there remain in the hundreds rather than the thousands recorded in Djibouti, a gap aid officials attribute less to demand than to the same seasonal sea conditions constraining the wider crossing, conditions expected to ease from mid-October. That timing matters: if the Bab el-Mandeb and Gulf of Aden routes to the African coast become more navigable at the same time Yemen's internal displacement is projected to nearly double, Somaliland and Puntland could see arrivals rise from a secondary detail in this crisis to a primary one, at ports considerably less equipped for a refugee influx than Djibouti's Obock reception system already under strain.

Why UNHCR named three countries, not one

UNHCR's 25 September decision to declare a Level 1 emergency, its lowest but still formal tier of internal crisis classification, enabling faster mobilization of staff and resources, covering Yemen, Djibouti and Somalia together rather than treating the refugee flow as an appendix to a Yemeni war is the clearest institutional signal yet that the agency views this as one regional crisis rather than a conflict in one country producing a caseload in another. That framing has practical consequences for funding, since a joint regional emergency designation is intended to let UNHCR draw on emergency mechanisms and cross-border planning that a country-specific appeal alone does not. It has not yet produced money to match the framing: the agency's Djibouti operation, which needed an estimated $5.1 million as of 18 September, was revised upward to a $13.5 million appeal within days as arrival numbers grew, and remained only fifteen percent funded as of the emergency declaration. UNHCR's Yemen operations fared little better, eighteen percent funded against a request for an additional $14 million to provide shelter, relief items and site management for the newly displaced.

A displacement crisis inside a strategic one

This humanitarian emergency is unfolding inside a security story FIKIR Institute has already flagged as a regional risk. The same Houthi seizure of Bab el-Mandeb that is now producing refugee crossings to Djibouti, Somaliland and Puntland was, two weeks earlier, a story about Washington declining Saudi Arabia's request to strike the Houthis and instead sending its own negotiators to secure safe passage for American and Israeli shipping, a deal that left Riyadh, and the wider question of who secures the strait, unresolved. Saudi Arabia's own answer, a Multinational Maritime Security Alliance launched in August 2026 with six African members, Egypt, Somalia, Djibouti, Sudan, Comoros and Nigeria, was built to police shipping lanes, not reception centres, and none of the reporting on its formation addresses a refugee flow that had not yet reached its current scale when the alliance was announced. The result is a Horn of Africa now managing the fallout of a strait it does not control, absorbing displaced people from a war its own governments have limited leverage to end, while the international response to the war's security dimension and its humanitarian one have so far moved on separate, largely unconnected tracks.

What to watch

Three indicators will show whether this emergency is stabilising or still accelerating. First, whether UNHCR's Djibouti appeal moves meaningfully past fifteen percent funded in the weeks after the Level 1 declaration, since a formal emergency classification that does not convert into funding will leave Djibouti's government carrying costs it has already said it cannot bear alone. Second, whether arrival numbers at Berbera and Bosaso rise materially once Gulf of Aden sea conditions ease from mid-October, which would confirm aid officials' expectation that Somaliland and Puntland are a leading indicator rather than a footnote to this crisis. Third, whether the internal Yemen displacement figure, 130,000 as of 25 September, tracks toward UNHCR's 230,000 projection or levels off, since the trajectory of that number is the clearest available proxy for whether the Houthi coastal campaign that triggered this crisis has stabilised or is still expanding.

Policy implications

For Djibouti, a government already hosting foreign military bases from multiple powers and positioning itself as the Horn's logistics hub now faces a domestic capacity test: whether Markazi and its northern reception points can absorb a caseload UNHCR itself expects to keep growing, without the funding to match. For Somaliland and Puntland, both administrations with contested international status and limited independent access to UN emergency financing, an influx concentrated at their own ports raises a question neither Hargeisa nor Garowe has had to answer at scale before, whether Yemen's displaced will be received under a coordinated regional framework or left to improvised, under-resourced local arrangements. For UNHCR and its donors, the gap between a Level 1 emergency declaration and fifteen percent funding is itself a test of whether the classification carries operational weight or functions mainly as an advocacy tool, one the agency's own Yemen appeal, eighteen percent funded, suggests has not yet been answered. For the wider international response to the Houthi seizure of Bab el-Mandeb, which has so far centred on shipping security, Saudi diplomacy and a US-brokered safe-passage arrangement, the emergence of a three-country UN humanitarian emergency is evidence that the strait's closure has already produced consequences none of those security-focused responses were designed to address.