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A wailing and distraught Rwandan woman, one of dozens overcome by grief at recalling the horror of the genocide, is carried away to receive help during a public ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda Monday, April 7, 2014. Sorrowful wails and uncontrollable sobs resounded Monday as thousands of Rwandans packed the country's main sports stadium to mark the 20th anniversary of the beginning of a devastating 100-day genocide. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

Rwandans gather under a banner, with writing in Kinyarwanda reading "Remember 20", at the Amahoro stadium in Kigali on April 7,2014, during a ceremony marking the 20th anniversary of Rwanda's genocide. Rwanda on April 7 held solemn commemorations marking the 20th anniversary of the genocide, with many survivors overcome with grief as they relived the trauma of the massacres that left nearly a million dead. The events also bore reminders of festering anger, as a major diplomatic row broke out over renewed allegations of French complicity in the genocide. AFP PHOTO / SIMON MAINA/AFP/Getty Images ( 528740782 )

Performers re-enacting some of the events enter a public ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda Monday, April 7, 2014. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

A wailing and distraught Rwandan man, one of dozens overcome by grief at recalling the horror of the genocide, is carried away to receive help during a public ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda Monday, April 7, 2014. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

People gather at Amahoro Stadium to commemorate the 20th anniversary of the 1994 genocide April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483212271 )

Global leaders, past and present, arrive for a commemoration ceremony at the Kigali Genocide Memorial Center on April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483195901 )

Performers enter the Amahoro stadium in Kigali on April 7,2014, during a ceremony marking the 20th anniversary of Rwanda's genocide. AFP PHOTO / SIMON MAINA/AFP/Getty Images ( 528740730 )

An emotionally distraught woman is carried out of Amahoro Stadium during the 20th anniversary commemoration of the 1994 genocide April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483212169 )

Men help carry a crying woman at the Amahoro stadium in Kigali on April 7,2014, during a ceremony marking the 20th anniversary of Rwanda's genocide. AFP PHOTO / SIMON MAINA/AFP/Getty Images ( 528742147 )

(L-R) Congo-Brazzaville President Denis Sassou Nguesso and first lady Antoinette Sassou-Nguesso, Rwanda President Paul Kagame and first lady Jeannette Kagame and Uganda President Yoweri Museveni participate in a wreath-laying ceremony at a tomb that holds 250,000 victims of the 1994 genocide during a ceremony at the Kigali Genocide Memorial Center on April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483195903 )

Performers enter Amahoro Stadium during the commemoration of the 20th anniversary of the 1994 genocide April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483212259 )

Tens of thousands of people gather at Amahoro Stadium to commemorate the 20th anniversary of the 1994 genocide April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483212263 )

Actors portray European colonial invaders and native peoples during the commemoration of the 20th anniversary the 1994 genocide at Amahoro Stadium April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483212501 )

The sky threatens rain as tens of thousands of people gather to commemorate the 20th anniversary the 1994 genocide at Amahoro Stadium April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483212497 )

Performers re-enact the events at a public ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda Monday, April 7, 2014. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

An emotionally distraught woman is carried out of Amahoro Stadium during the 20th anniversary commemoration of the 1994 genocide April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483215865 )

Performers re-enact the events at a public ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda, Monday, April 7, 2014. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

Bizimana Emmanuel, who was born two years before the genocide, is consoled by an unidentified woman while attending a public ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda, Monday, April 7, 2014. (AP Photo/Ben Curtis) ( APTOPIX Rwanda Genocide Anniversary )

Former British Prime Minister Tony Blair, left, and Former South African President Thabo Mbeki, right, lay a memorial wreath at a ceremony to mark the 20th anniversary of the Rwandan genocide, held at the Kigali Genocide Memorial Center in Kigali, Rwanda Monday, April 7, 2014. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

Rwandan President Paul Kagame, seen on a large television screen, addresses the public and dignitaries at a ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda Monday, April 7, 2014. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

Dignitaries prepare to lay memorial wreaths on stone-topped vaults containing the remains of around 250,000 victims of the genocide, at a ceremony to mark the 20th anniversary of the Rwandan genocide, held at the Kigali Genocide Memorial Center in Kigali, Rwanda Monday, April 7, 2014. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

A wailing and distraught Rwandan woman, one of dozens overcome by grief at recalling the horror of the genocide, is carried away to receive help during a public ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda Monday, April 7, 2014. (AP Photo/Ben Curtis) ( APTOPIX Rwanda Genocide Anniversary )

Rwandan President Paul Kagame addresses the public and dignitaries at a ceremony to mark the 20th anniversary of the Rwandan genocide, at Amahoro stadium in Kigali, Rwanda Monday, April 7, 2014. (AP Photo/Ben Curtis) ( Rwanda Genocide Anniversary )

Rwanda's president Paul Kagame (L) and First Lady Janet Kagame lay a wreath of flower at the the Gizosi Genocide Memorial in Kigalia on April 7,2014. Solemn commemorations marking the 20th anniversary of Rwanda's genocide begins today and Kagame will light a flame that will burn for 100 days, the length of time it took government soldiers and "Hutu power" militiamen to carry out their plan to wipe out the "Inyenzi" -- a term meaning "cockroaches" that was used by Hutu extremists to denigrate and designate the minority Tutsis. The well-planned and viciously executed genocide began on April 6, 1994, shortly after Hutu president Juvenal Habyarimana was killed when his plane was shot down over Kigali. Roadblocks were set up, with Tutsi men, women and children of all ages butchered with machetes, guns and grenades. AFP PHOTO / SIMON MAINA/AFP/Getty Images ( 528738592 )

South Sudan's President Salva Kiir (C) arrives at the Amahoro stadium, in Kigali, on April 7,2014, during a ceremony marking the 20th anniversary of Rwanda's genocide. Rwandan President Paul Kagame took a thinly-veiled swipe at France on April 7, saying it was impossible to "change the facts" about the genocide 20 years ago. AFP PHOTO / SIMON MAINA/AFP/Getty Images ( 528740560 )

Rwanda President Paul Kagame arrives to lay a wreath of flowers at the the Gizosi Genocide Memorial in Kigali, on April 7, 2014. AFP PHOTO / SIMON MAINA/AFP/Getty Images ( 528742449 )

Women cry at the Amahoro stadium in Kigali, on April 7,2014, as they attend a ceremony marking the 20th anniversary of Rwanda's genocide. Rwandan President Paul Kagame took a thinly-veiled swipe at France on April 7, saying it was impossible to "change the facts" about the genocide 20 years ago. AFP PHOTO / SIMON MAINA/AFP/Getty Images ( 528742145 )

Rwanda President Paul Kagame, first lady Jeannette Kagame and UN Secretary General Ban Ki Moon light the Flame of Remembrance at the Kigali Genocide Memorial Center on April 7, 2014 in Kigali, Rwanda. (Photo by Chip Somodevilla/Getty Images) ( 483195821 )