A cholera epidemic raging across Yemen is spiralling out of control, with around one child falling sick every minute.
Thousands of people could die in the coming months with up to 300,000 cases predicted, Save the Children aid agency said on Wednesday, adding that the infection rate had tripled in a fortnight.
Two years of civil war, near-famine conditions and a lack of access to clean water have exacerbated the spread of cholera - a diarrhoeal disease that can kill within hours.
The country's health system - already on its knees - is reeling with hospitals overwhelmed and quickly running out of medicines and intravenous fluids.
The UN children's agency UNICEF said more than 920 people had died from the disease since late April and more than 124,000 cases had been recorded - almost half of them children.
Grant Pritchard, Save the Children's representative in Yemen, called for an increase in emergency funding to tackle the epidemic.
"It's time for the world to take action before thousands of Yemeni boys and girls perish from an entirely preventable disease," he said in a statement.
"Disease, starvation and war are causing a perfect storm of disaster for Yemen's people. The region's poorest country is on the verge of total collapse, and children are dying because they're not able to access basic healthcare."
Yemen's civil war, pitting the Iran-allied Houthi group against a Western-backed Arab coalition led by Saudi Arabia, has left 19 million people needing humanitarian aid with many on the verge of famine.
More than two million children are acutely malnourished making them particularly vulnerable to cholera as their weakened systems are less able to fight off disease, Save the Children said.
Pritchard said restrictions on bringing aid and medical supplies into Yemen, including delays accessing Hodeidah port and the closure of Sanaa airport, were compounding difficulties in halting the epidemic.
Unaffordable transport is also making it hard for people to reach treatment.
