Photographs of people who were killed during the 1994 genocide are seen inside the Kigali Genocide Memorial Museum as the country prepares to commemorate the 20th anniversary of the genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during the genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY POLITICS) 

Preserved human skulls are seen on display at the Kigali Genocide Memorial Centre, as the country prepares to commemorate the twentieth anniversary of the 1994 genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during this genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY CIVIL UNREST POLITICS) 

A portrait of young boy killed during the 1994 genocide is seen inside the Kigali Genocide Memorial Museum as the country prepares to commemorate the 20th anniversary of the genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during the genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY POLITICS) 

Rwandan people sit inside the Kigali Genocide Memorial Museum as the country prepares to commemorate the 20th anniversary of the 1994 genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during the genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY POLITICS) 

A wall with portraits of young children killed during the 1994 genocide is seen inside the Kigali Genocide Memorial Museum as the country prepares to commemorate the 20th anniversary of the genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during the genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY CIVIL UNREST POLITICS) 

Sculptures depicting the suffering of the Rwandan people are pictured inside the Kigali Genocide Memorial Museum as the country prepares to commemorate the 20th anniversary of the 1994 genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during this genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY POLITICS) 

Preserved human skulls are seen on display at the Kigali Genocide Memorial Centre, as the country prepares to commemorate the twentieth anniversary of the 1994 genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during this genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY CIVIL UNREST POLITICS) 

A sandal is placed next to preserved human skulls on display at the Kigali Genocide Memorial Centre, as the country prepares to commemorate the twentieth anniversary of the 1994 genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during this genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY CIVIL UNREST POLITICS) 

People sit inside the Kigali Genocide Memorial Museum as the country prepares to commemorate the 1994 Genocide in the Rwandan capital April 5, 2014. An estimated 800,000 people were killed in 100 days during the genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY POLITICS) 

Visitors walk past a mass grave site at the Kigali Genocide Memorial Centre, as the country prepares to commemorate the twentieth anniversary of the 1994 genocide in the Rwandan capital Kigali April 5, 2014. An estimated 800,000 people were killed in 100 days during this genocide. REUTERS/Noor Khamis (RWANDA - Tags: ANNIVERSARY CIVIL UNREST POLITICS)