Commuters and traders of the Oshodi area of Lagos, the commercial nerve centre of Nigeria with a population of over twelve million people, make their way through crowded streets on April 30, 2001. (Photo by George Esiri/Reuters)





This Sunday August 28, 2016 file photo shows a general view of one of the biggest camp for people displaced by Islamist Extremist in Maiduguri, Nigeria. Camps for thousands of people displaced by Boko Haram will have to stay open beyond the end of this month as Nigeria's military continues to fight the extremists in so-called liberated areas, officials say. The governor of the northern state of Borno, Kashim Shettima, told reporters on Tuesday, May 16, 2017 that it is not yet safe to return people to their homes in many places across the region. (Photo by Sunday Alamba/AP Photo)





A man walks towards a bus discharging fumes from its exhaust at a bus park in Abuja, Nigeria, February 1, 2017. (Photo by Afolabi Sotunde/Reuters)





A man sells plantain chips near a bus with smoke seen from its exhaust at a bus park in Abuja, Nigeria, February 1, 2017. (Photo by Afolabi Sotunde/Reuters)





Canoes are seen at a bank of a polluted river along the creeks in the oil producing state of Rivers, Nigeria photo taken January 5, 2017. (Photo by Afolabi Sotunde/Reuters)





Children attend a class at a makeshift pre-school supported by Save the Children in Maiduguri, Nigeria February 14, 2017. (Photo by Paul Carsten/Reuters)





A family of refugees shelters under a truck carrying plastic lota, kettles used to perform Muslim ablutions in Muna Garage, Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





Two men stand between trucks laden with goods in Muna Garage area Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





A man passes between trucks laden with goods in Muna Garage area Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





Refugees wait on top of a truck in the Muna Garage area in the northeastern Nigerian city of Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





Young men and boys wait by a truck in the Muna Garage area on the outskirts of Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





A refugee gathers thatch for the makeshift shacks at Muna Garage in the city of Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





Hundreds of refugees rest on top of trucks laden with their belongings and construction materials waiting for the military convoy to led them home from Muna Garage Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





Hafsat Mamuda, 18, looks down while being interviewed by Reuters at Muna Garage area of Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





A refugee boy selling loaves of bread pushes his cart past trucks full of people in the Muna Garage Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





A young child plays by the thatch shacks used by many refugees to build their homes in the Muna Garage area in the city of Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





Haruna Abdullahi Balarabe is seen in her car hoping to join the military convoy leading them at the Muna Garage area of Maiduguri, Nigeria February 16, 2017. (Photo by Paul Carsten/Reuters)





Refugees rest on, under and next to a truck in the Muna Garage area on the outskirts of Maiduguri February 16, 2017. (Photo by Paul Carsten/Reuters)





Nigerian returnees from Niger wait to be processed by the Nigeria Immigration service at Damasak, Borno, Nigeria April 25, 2017. (Photo by Afolabi Sotunde/Reuters)





Nigerian returnees from Niger wait to be processed by the Nigeria Immigration service at Damasak, Borno, Nigeria April 25, 2017. (Photo by Afolabi Sotunde/Reuters)





The parents of the rescued Chibok girls wait to be reunited with their children in Abuja, Nigeria May 20, 2017. (Photo by Afolabi Sotunde/Reuters)





Recently freed schoolgirls prior to being reunited with their parents, in Abuja, Nigeria, Saturday, May 20, 2017. The 82 Nigerian schoolgirls recently released after more than three years in Boko Haram captivity reunited with their families for the first time Saturday, as anxious parents looked for signs of how deeply the extremists had changed their daughters' lives. (Photo by Olamikan Gbemiga/AP Photo)





In this Sunday, August 28, 2016 file photo, a child plays in a makeshift tent camp for people displaced by Islamist Extremist in Maiduguri, Nigeria. (Photo by Sunday Alamba/AP Photo)





A boy sells boiled eggs on the outskirt of the town of Damasak in North East Nigeria on April, 25 2017 as thousands of Nigerians, who were freed in 2016 by the Nigerian army from Boko Haram insurgents, are returning to their homes in Damasak. Yagana Bukar's younger brothers Mohammed and Sadiq were among about 300 children kidnapped by Boko Haram from the town of Damasak in remote northeastern Nigeria nearly three years ago. But instead of the global outrage and social media campaign that followed a similar abduction of 219 schoolgirls from the town of Chibok, there were no protests for the children of Damasak. (Photo by Florian Plaucheur/AFP Photo)





A girl watches other children playing on a merry-go-round in an abandoned amusement park in Maiduguri, Nigeria, on April 27, 2017. In Maiduguri, where the population has doubled to over two million as a result of Boko Haram insurgency, thousands of children are homeless. (Photo by Florian Plaucheur/AFP Photo)