A man reacts to the camera while he sits in a cafe in the old market in the historic city of Sanaa, Yemen, October 21, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A barber is seen reflected in a mirror as he shaves his customer at his shop in the old market in the historic city of Sanaa, Yemen, October 21, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A man looks at a phone while at his shop in the old market in the historic city of Sanaa, Yemen, October 21, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A woman begs for money along a street in the old market in the historic city of Sanaa, Yemen, October 21, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





People shop at the old market in the historic city of Sanaa, Yemen, October 21, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





Followers of the Shi'ite Houthi movement shout slogans as they attend a rally commemorating the death of Imam Zaid bin Ali in Sanaa, Yemen October 26, 2016. (Photo by Khaled Abdullah/Reuters)





A follower of the Shi'ite Houthi movement gestures as he stands on a military vehicle near the site of a rally commemorating the death of Imam Zaid bin Ali in Sanaa, Yemen October 26, 2016. (Photo by Khaled Abdullah/Reuters)





A police trooper wears a headband with a poster of the leader of the Shi'ite Houthi movement Abdul-Malik al-Houthi during a rally commemorating the death of Imam Zaid bin Ali in Sanaa, Yemen October 26, 2016. The headband reads “The anniversary of the martyrdom of Imam Zaid bin Ali”. (Photo by Khaled Abdullah/Reuters)





A girl carries a rifle as she attends a rally by followers of the Shi'ite Houthi movement commemorating the death of Imam Zaid bin Ali in Sanaa, Yemen October 26, 2016. (Photo by Khaled Abdullah/Reuters)





Mourners cover with earth the coffin of Major-General Omar bin Halles Yafei of the Inspector General at the Ministry of the Interior and his son, Capt. Mohammed Omar Yafei, who were killed by an apparent Saudi-led air strike that ripped through a wake attended by some of the country's top political and security officials in October 8, during their funeral in Sanaa, Yemen, October 27, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





Soldiers carry the coffin of Major-General Omar bin Halles Yafei of the Inspector General at the Ministry of the Interior and his son, Capt. Mohammed Omar Yafei, who were killed by an apparent Saudi-led air strike that ripped through a wake attended by some of the country's top political and security officials on October 8, during their funeral in Sanaa, Yemen, October 27, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A soldier holds a rifle with a photo of Major-General Omar bin Halles Yafei of the Inspector General at the Ministry of the Interior during his and his son's funeral in Sanaa, Yemen, October 27, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A man walks on the rubble of a house destroyed during a recent conflict in the northwestern city of Saada, Yemen October 31, 2016. (Photo by Naif Rahma/Reuters)





A police trooper mans a machine gun mounted on a patrol truck securing a street where people loyal to Yemen's President Abd-Rabbu Mansour Hadi demonstrated to show support to Hadi in the country's northern city of Marib November 3, 2016. (Photo by Ali Owidha/Reuters)





Soldiers loyal to Yemen's President Abd-Rabbu Mansour Hadi walk outside a government building in the country's northern city of Marib November 3, 2016. (Photo by Ali Owidha/Reuters)





Police troopers loyal to Yemen's President Abd-Rabbu Mansour Hadi secure a street where people demonstrated to show support to Hadi in the country's northern city of Marib November 3, 2016. (Photo by Ali Owidha/Reuters)





Houthi militants fire a weapon during a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen perform the traditional Baraa dance during a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen shout slogans as they ride on the back of a truck during a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





A tribesman reacts during a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





A boy carries a weapon during a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Boys carry weapons during a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





A boy carries a weapon as he attends a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





A tribesman performs the traditional Baraa dance as he carries a weapon during a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen ride on the back of a truck as they attend a tribal gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Houthi militants ride on the back of a patrol truck as they attend a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen hold their weapons as they attend a tribal gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen hold their weapons as they attend a tribal gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen attend a gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen hold their weapons as they attend a tribal gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen hold their weapons as they attend a tribal gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen ride on the back of a truck as they attend a tribal gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen ride on the back of a truck as they attend a tribal gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Houthi militants ride on the back of a patrol truck during a tribal gathering held to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





Tribesmen attend a tribal gathering to show support to the Houthi movement in Sanaa, Yemen November 10, 2016. (Photo by Khaled Abdullah/Reuters)





A boy looks at the camera as he sits on the wreckage of a house destroyed by a Saudi-led air strike on the outskirts of Sanaa, Yemen, November 13, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A boy uses a cell phone to take photos of the wreckage of a house destroyed by a Saudi-led air strike on the outskirts of Sanaa, Yemen, November 13, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A man salvages furniture from the wreckage of a house destroyed by a Saudi-led air strike on the outskirts of Sanaa, Yemen November 13, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A boy sits on the wreckage of a house destroyed by a Saudi-led air strike on the outskirts of Sanaa, Yemen, November 13, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





People gather on a street following battles between Houthi fighters and pro-government fighters in the southwestern city of Taiz, Yemen November 17, 2016. (Photo by Anees Mahyoub/Reuters)





Pro-government fighters carry a comrade injured during fighting against Houthis in the southwestern city of Taiz, Yemen November 17, 2016. (Photo by Anees Mahyoub/Reuters)





A man rides a motorbike past a house destroyed during recent battles between Houthi fighters and pro-government fighters in the southwestern city of Taiz, Yemen November 18, 2016. (Photo by Anees Mahyoub/Reuters)





A woman carries a jerrycan filled with potable water from a charity tap during the first day of a 48-hour ceasefire in Sanaa, Yemen November 19, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A woman uses a wheelbarrow to carry a jerrycan filled with potable water from a charity tap during the first day of a 48-hour ceasefire in Sanaa, Yemen November 19, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A boy stands next to jerrycans filled with potable water from a charity tap during the first day of a 48-hour ceasefire in Sanaa, Yemen November 19, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A girl carries a jerrycan filled with potable water from a charity tap during the first day of a 48-hour ceasefire in Sanaa, Yemen November 19, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





People fill jerrycans with potable water from a charity tap during the first day of a 48-hour ceasefire in Sanaa, Yemen November 19, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A woman carries empty jerrycans to fill them with potable water from a charity tap during the first day of a 48-hour ceasefire in Sanaa, Yemen November 19, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





A pro-government fighter walks at the site of recent battles between Houthi fighters and pro-government fighters, on the second day of a 48-hour ceasefire in the southwestern city of Taiz, Yemen November 20, 2016. (Photo by Anees Mahyoub/Reuters)





A shoemaker takes a nap at the old market during the second day of a 48-hour ceasefire in Sanaa, Yemen November 20, 2016. (Photo by Mohamed al-Sayaghi/Reuters)





Pro-government fighters stand in front of a damaged building in the southwestern city of Taiz, Yemen November 21, 2016. (Photo by Anees Mahyoub/Reuters)





Pro-government fighters gather near a tank in the southwestern city of Taiz, Yemen November 21, 2016. (Photo by Anees Mahyoub/Reuters)





Pro-government fighters ride in the trunk of a car in the southwestern city of Taiz, Yemen November 21, 2016. (Photo by Anees Mahyoub/Reuters)





This October 14, 2016, file photo shows fire and smoke rise after a Saudi-led airstrike hit a site believed to be one of the largest weapons depots on the outskirts of Yemen's capital, Sanaa. The warring parties in Yemen have agreed to a 72-hour cease-fire which is to take effect shortly before midnight Wednesday, the U.N. special envoy to Yemen announced Monday, Oct. 17, 2016. A U.N. statement said Special Envoy Ismail Ould Cheikh Ahmed welcomes the restoration of the Cessation of Hostilities, which will spare the Yemeni people further bloodshed and will allow for the expanded delivery of humanitarian assistance. (Photo by Hani Mohammed/AP Photo)





Yemeni men chat while sitting in front of their house in the old city of Sanaa, Yemen, Saturday, November 19, 2016. (Photo by Hani Mohammed/AP Photo)