German Chancellor Angela Merkel and Nigerien President Mahamadou Issoufou attend a news conference at the chancellery in Berlin, Germany, June 17, 2016. REUTERS/Hannibal Hanschke

German Chancellor Angela Merkel and Nigerien President Mahamadou Issoufou attend a news conference at the chancellery in Berlin, Germany, June 17, 2016. REUTERS/Hannibal Hanschke

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

A Nigerien construction worker speaks with his Chinese supervisor on the construction site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

Chinese and Nigerien construction workers work on the site of an Islamic university in Niamey, Niger, February 22, 2016. REUTERS/Joe Penney 

A camel transporter fixes a muzzle on a camel in Niamey, Niger, February 21, 2016. REUTERS/Joe Penney TPX IMAGES OF THE DAY

A boy peers through a window to watch electoral officials count ballots at a polling station in Niamey, Niger, February 21, 2016. REUTERS/Joe Penney TPX IMAGES OF THE DAY

Supporters of incarcerated presidential candidate Hama Amadou attend a campaign rally in Niamey, Niger, February 19, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney TPX IMAGES OF THE DAY

Supporters of incumbent President Mahamadou Issoufou attend a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Supporters of incumbent President Mahamadou Issoufou attend a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

A supporter of incumbent President Mahamadou Issoufou poses for a picture at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney TPX IMAGES OF THE DAY

A supporter of incumbent President Mahamadou Issoufou wearing body paint poses for a picture at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

A vendor sells kola nuts outside a campaign rally for incumbent President Mahamadou Issoufou in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Supporters of incumbent President Mahamadou Issoufou wear body paint at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Incumbent President Mahamadou Issoufou speaks at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Supporters of incumbent President Mahamadou Issoufou pose for a picture at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Supporters of incumbent President Mahamadou Issoufou attend a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

A supporter of incumbent President Mahamadou Issoufou holds an umbrella at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Supporters of incumbent President Mahamadou Issoufou attend a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Incumbent President Mahamadou Issoufou (C) arrives at a campaign rally surrounded by soldiers in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Incumbent President Mahamadou Issoufou raises his fist at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Supporters of incumbent President Mahamadou Issoufou cheer at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Incumbent President Mahamadou Issoufou raises his fists at a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Soldiers walk past a cheering crowd at a campaign rally for incumbent President Mahamadou Issoufou in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Supporters of incumbent President Mahamadou Issoufou attend a campaign rally in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney TPX IMAGES OF THE DAY

The name "Issoufou" is seen spelled out at a campaign rally for incumbent President Mahamadou Issoufou in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

A soldier stands guard at a campaign rally for incumbent President Mahamadou Issoufou in Niamey, Niger, February 18, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

A boy gets water to make tea in Niamey, Niger, February 16, 2016. REUTERS/Joe Penney 

People walk in a courtyard in Niamey, Niger, February 16, 2016. REUTERS/Joe Penney 

Supporters of incumbent President Mahamadou Issoufou wear party clothing in Niamey, Niger, February 16, 2016. Niger will hold presidential and legislative elections on Sunday. REUTERS/Joe Penney 

A security officer sleeps with his gun next to him on the roof of the headquarters of MDR-Tarna political party in Niamey, Niger, February 16, 2016. Niger will hold presidential and legislative elections on Sunday. MDR stands for Movement for Democratic Renewal. REUTERS/Joe Penney TPX IMAGES OF THE DAY

A boy walks past electoral campaign posters for presidential candidates in Niamey, Niger, February 16, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Supporters of the PNDS-Tarayya pose for a picture wearing party t-shirts in Niamey, Niger, February 16, 2016. Niger holds presidential and legislative elections on Sunday. PNDS-Tarayya stands for the Nigerien Party for Socialism and Democracy. REUTERS/Joe Penney 

A woman walks past electoral campaign posters for presidential candidate Seini Oumarou in Niamey, Niger, February 16, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney TPX IMAGES OF THE DAY

A man rides past electoral campaign posters for presidential candidate Seini Oumarou in Niamey, Niger, February 16, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney 

Workers tend to a gas station in Niamey, Niger, February 16, 2016. REUTERS/Joe Penney 

Students gather at a cemetery to commemorate student leaders killed during a 1990 protest, which started a democracy movement, in Niamey, Niger, February 16, 2016. REUTERS/Joe Penney 

Students pray at graves during a ceremony to commemorate student leaders killed during a 1990 protest, which started a democracy movement, in Niamey, Niger, February 16, 2016. REUTERS/Joe Penney 

Students gather at a cemetery to commemorate student leaders killed during a 1990 protest, which started a democracy movement, in Niamey, Niger, February 16, 2016. REUTERS/Joe Penney 

Students gather at a cemetery to commemorate student leaders killed during a 1990 protest, which started a democracy movement, in Niamey, Niger, February 16, 2016. REUTERS/Joe Penney 

Students gather at a cemetery to commemorate student leaders killed during a 1990 protest, which started a democracy movement, in Niamey, Niger, February 16, 2016. REUTERS/Joe Penney 

Niger presidential candidate Adel Rhoubeid poses for a picture at his campaign headquarters in Niamey, Niger, February 16, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney TPX IMAGES OF THE DAY

Members of the Belgian special forces train Nigerien soldiers during Flintlock 2016, a U.S.-led international training exercise with African militaries in Thies, Senegal, February 11, 2016. REUTERS/Sylvain Cherkaoui 

Nigerien soldiers undergo marksmanship training with a Belgian special forces soldier during Flintlock 2016, a U.S.-led international training exercise with African militaries in Thies, Senegal, February 11, 2016. REUTERS/Sylvain Cherkaoui 

A Belgian special forces soldier trains Nigerien soldiers during Flintlock 2016, a U.S.-led international training exercise with African militaries in Thies, Senegal, February 11, 2016. REUTERS/Sylvain Cherkaoui 

A Belgian special forces soldier trains Nigerien soldiers during Flintlock 2016, a U.S.-led international training exercise with African militaries in Thies, Senegal, February 11, 2016. REUTERS/Sylvain Cherkaoui 

A Belgian special forces soldier checks a target next to a Nigerien soldier during Flintlock 2016, a U.S.-led international training exercise with African militaries in Thies, Senegal, February 11, 2016. REUTERS/Sylvain Cherkaoui 

Belgian special forces train Nigerien soldiers during Flintlock 2016, a U.S.-led international training exercise with African militaries in Thies, Senegal, February 11, 2016. REUTERS/Sylvain Cherkaoui 

Nigerien designer Alphadi (L) gives an interview while another designer arranges his outfits on a rack during the Festi'Bazin trade show in Bamako, Mali, October 15, 2015. Gasps of delight filled the convention hall as models, decked out in Mali's signature bazin fabric in crimson reds, indigoes and neon greens, strutted the catwalk while musicians from across the West African nation provided the soundtrack. Bazin, a polished, heavy cotton fabric with a distinctive sheen, is extremely popular across the region and is worn at almost all formal occasions in Mali. "If you show up to a marriage without wearing bazin, you might as well not show up at all," said Baba Sereme, a designer known for his bazin suits for men, with hand-dyed elaborate colour schemes. REUTERS/Joe Penney PICTURE 3 OF 25 FOR WIDER IMAGE STORY "SHINING ON THE STREETS OF BAMAKO". SEARCH "BAZIN" FOR ALL IMAGES. 

Niger soldiers provide security for an anti-Boko Haram summit in Diffa city, Niger September 3, 2015. Picture taken September 3, 2015. To match Exclusive USA-NIGER/BOKO HARAM REUTERS/Warren Strobel 

Sergeant Fougou Saley, the head of Niger's civil-military affairs unit for Diffa region, speaks during an interview at the U.S. Special Operations Forces compound following a counter-Boko Haram summit in Diffa, Niger September 3, 2015. Picture taken September 3, 2015. To match Exclusive USA-NIGER/BOKO HARAM REUTERS/Warren Strobel 

Niger soldiers provide security for an anti-Boko Haram summit in Diffa city, Niger September 3, 2015. Picture taken September 3, 2015. To match Exclusive USA-NIGER/BOKO HARAM REUTERS/Warren Strobel