Yemen has been divided by nearly two years of civil war that pits the Iran-allied Houthi group against a Western-backed Sunni Arab coalition, led by Saudi Arabia that is carrying out air strikes. At least 10,000 people have been killed in the fighting.

Yemen Civil War
Yemen Civil War
Yemen Civil War
Yemen Civil War
Yemen Civil War

The United Nations said that 12 million people in Yemen face the threat of famine, and the situation is rapidly deteriorating. Nearly 3.3 million people – including 2.1 million children – are acutely malnourished, UN figures show. They include 460,000 children under age five with the worst form of malnutrition who risk dying of pneumonia or diarrhoeal disease. An estimated 63,000 Yemeni children died last year of preventable causes often linked to malnutrition, Unicef said.

IBTimes UK looks back at nearly two years of devastating civil war in the Arab world's poorest nation.

Yemen Civil War
12 June 2015: People search for survivors under the rubble of houses in the Unesco-listed heritage site in the old city of Yemeni capital Sanaa following an overnight Saudi-led air strike Mohammed Huwais/AFP
Yemen Civil War
17 June 2015: People look at the body of a man hanging on a bridge in Yemen's southeastern city of Mukalla. Al-Qaeda militants killed two alleged Saudi spies, accusing them of planting tracking devices which enabled the assassination of the group's leader in a suspected US drone strike Reuters
Yemen Civil War
27 June 2015: Yemeni fighters of the southern separatist movement and firefighters attempt to extinguish a flame at an oil refinery in the port city of Aden, following shelling by Shia Houthi rebels Saleh al-Obeidi/AFP
Yemen Civil War
9 August 2015: A man sits at a site which the Houthi-led authorities say was hit by a Saudi-led air strike at the Unesco-listed old quarter of Yemen's capital Sanaa Khaled Abdullah/Reuters
Yemen Civil War
15 October 2015: A Yemeni soldier, pictured through a bullet hole in a vehicle's windscreen, gestures out of the window in the city of Marib Angus McDowall/Reuters
Yemen Civil War
22 May 2016: People take part in celebrations marking the 26th anniversary of Yemen's 1990 reunification in the capital Sanaa Mohammed Huwais/AFP
Yemen Civil War
15 June 2016: Young Houthi militants sit on the side of a road as they secure a street near the United Nations offices in Sanaa Khaled Abdullah/Reuters
Yemen Civil War
16 August 2016: Damage is seen inside a hospital operated by Medecins Sans Frontieres after it was hit by a Saudi-led coalition air strike in the Abs district of Hajja province Abduljabbar Zeyad/Reuters
Yemen Civil War
19 December 2016: A tribesman from the Popular Resistance Committee, supporting forces loyal to Yemen's Saudi-backed President Abedrabbo Mansour Hadi, fires a weapon as a fellow fighter rescues the body of a dead comrade in the country's third-city of Taez during clashes with Shia Houthi rebels Ahmad al-Basha/AFP

Some 18.8 million people, or more than two-thirds of Yemen's population, need some form of assistance, and about 10 million of those are "acutely affected" — requiring aid in the form of food, water, health care and protection to sustain and save their lives, the UN said.

About 55% of Yemen's medical facilities do not function and the health ministry has no operational budget, said Jamie McGoldrick, UN humanitarian coordinator in Yemen. "Many of the people never make it to the feeding centres or the hospitals because they can't afford the transport," he said. "Many people die silent and unrecorded deaths, they die at home, they are buried before they are ever recorded."

"Ongoing air strikes and fighting continue to inflict heavy casualties, damage public and private infrastructure, and impede delivery of humanitarian assistance," the UN said. "The Yemeni economy is being wilfully destroyed," it added, saying that ports, roads, bridges, factories and markets have been hit.