Yemeni children sit at the Jaw al-Naseem camp for internally displaced people on the outskirts of the northern city of Marib, on February 18, 2021 in the Saudi-backed Yemeni government's last northern bastion. - Until early last year, life in Marib city was relatively peaceful despite the Yemen's civil war that erupted in 2014. The United Nations warned last week of a potential humanitarian disaster if the fight for Marib continues, saying it has put "millions of civilians at risk". More than 3.3 million have been displaced across the country, making them vulnerable to outbreaks of cholera, malaria and dengue fever due to lack of proper sanitation and healthcare. (Photo by Nabil ALAWZARI / AFP)