The International Organisation for Migration (IOM) warns that the figure is rising ‘by the hour’ as it calls for safe humanitarian access.

More than 46,000 people have been driven from their homes in Yemen in the wake of the latest escalation in fighting between Houthi rebels and government forces, according to United Nations data.

The International Organisation for Migration (IOM) warned that the figure is rising “by the hour” in a statement issued on Friday.

The UN agency called on all parties to the conflict to guarantee safe humanitarian access and protect civilians, aid workers and humanitarian assets on the ground.

“Families are being forced to flee for the second or third time in this conflict, with almost nothing left,” Amy Pope, head of the IOM, said in the statement.

The agency said many people had reportedly fled Mocha with their belongings overnight after the Iran-allied Houthi rebels captured the strategically important Red Sea port city from the internationally recognised government on Thursday.

Entire villages were said to have been abandoned in some areas of the war-torn country. The IOM urged the parties to the conflict to guarantee humanitarian access and ensure the safety of aid workers.

The statement came amid reports on Friday that the Houthis had captured a strategically located island in the Bab al-Mandeb Strait and now control Yemen’s entire Red Sea coast.

‘Two new crises’

Separately on Friday, the UN also voiced concern over the Houthis seizing a key humanitarian compound and its assets in Mocha, warning that humanitarian personnel and facilities must be protected.

“The compound houses staff of UN agencies working to provide humanitarian assistance to vulnerable communities in the area,” UN deputy spokesperson Farhan Haq told reporters.

All UN personnel working at the compound had left before the seizure and were “safe and accounted for”, Haq added.

Haq stressed that humanitarian personnel, premises and assets “must be respected and protected at all times”, while calling for safe and unimpeded humanitarian access so life-saving assistance can continue reaching people in need.

Farea Al-Muslimi, a Yemen researcher at the London-based Chatham House thinktank, told Al Jazeera that deteriorating humanitarian conditions in Yemen will build on what was already one of the world’s worst crises.

“Yemen was already going through one of the worst humanitarian crises in the world,” Al-Muslimi said.

“It got terribly worse after the Houthis cracked down on aid organisations in northern Yemen. But the war continued despite the fragile truce, and what that meant was the destruction of what remained of the economy, with millions of families left without income,” he said.

Al-Muslimi warned that the latest escalation “will create two new crises”, one being further internal displacement, noting that “we’ve already seen more than 10,000 families displaced in the last week alone”, and the other being rising prices for goods inside Yemen.

“Since this is [happening in] a maritime [trade] corridor, it will, for sure, drive further violence inside Yemen, but also from outside Yemen,” Al-Muslimi added.

“The Yemeni population will continue to suffer, first and foremost, more than anyone else, inside or outside the country.”