A child from a poor family stands outside his house in a slum in Sanaa, , on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the , the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

A girl from a poor family carries a little child as she walks in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

A woman from a poor family sits with her children inside their house in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

A child from a poor family stands outside his house in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

A woman from a poor family stands inside her house in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

People from a poor family stand outside their house in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

Children from poor families play in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

A girl from a poor family looks out through an open on their house's wall in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

A child from a poor family stands outside his house in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali)

A woman from a poor family sits with her children inside their house in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali) 10

A child from a poor family stands outside his house in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali) 11

Children from poor families pose to be photographed in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali) 12

Children from poor families play in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali) 13

A man from a poor family stands with his son inside their house in a slum in Sanaa, Yemen, on April 20, 2016. Yemen's rebel Shiite Houthi group and its allies loyal to former President Ali Abdullah Saleh have agreed to take part in the delayed peace talks sponsored by the United Nations, the group said on Wednesday. (Xinhua/Mohammed Hani Ali) 14