More than 112,000 people have been displaced in Yemen and close to 3,000 have fled the conflict to Djibouti, according to the United Nations, as fighting intensifies between the Iran-allied Houthis and Saudi-backed forces loyal to the internationally recognised government.

“Our resources are very, very, very limited and our stocks will be depleted very soon,” Abdusattor Esoev, mission chief in Yemen for the International Organization for Migration, told reporters on Friday.

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Most of the more than 112,000 internally displaced people have been displaced over the last two weeks, mainly along the west coast and in the provinces of Taiz and Lahj, he added.

The displacement began when the Houthis made a rapid advance, seizing control of the entire Red Sea coast of Yemen to tighten their grip on the vital shipping route, the Bab al-Mandeb Strait.

Esoev estimates 22 million Yemenis – or nearly half the population – are in urgent need of humanitarian aid.

More than 65,000 registered refugees and asylum seekers in Yemen, mainly from Somalia and Ethiopia, are also threatened.

3,000 Yemenis flee to Djibouti

The crisis is growing “by the hour”, warned Francesco Galtieri, a representative for the UN Population Fund (UNFPA), adding that thousands of women who have lost all their possessions are on the run with their children.

Galtieri estimates that 2,000 pregnant women are among the displaced and around 200 are expected to give birth shortly.

Around 3,000 Yemenis have fled Yemen by boat to Djibouti, the UN refugee agency said. The shortest route across the Bab al-Mandeb Strait is just over 25 kilometres.

The UNHCR reports that more than 2,400 people made the voyage in the past week – mostly women, children and older people.

The influx is adding pressure on Djibouti and population of about one million people. It already hosts around 36,000 refugees, most from Somalia and Ethiopia, said UNHCR representative Sandrine Desamours.

“While the number may sound small,” it must be seen in proportion to the population, she added.

The strategically important Bab al-Mandeb links the Red Sea with the Gulf of Aden and has become an alternative shipping route as the United States’ war against Iran choked the Strait of Hormuz.