Commemorations have begun in Rwanda to mark the 25th anniversary of the genocide that killed about a tenth of the population.
The country will mourn for 100 days, the time it took in 1994 for 800,000 Rwandans to be massacred.
Most were minority Tutsis, killed by ethnic Hutu extremists.
President Paul Kagame, who led the rebel force that ended the genocide, lit a remembrance flame at the memorial in the capital, Kigali.
How will Rwanda remember?
The commemoration activities began with the flame-lighting ceremony at the memorial, where about 250,000 victims are said to be buried. The flame will burn for 100 days.
The 61-year-old president, who has led the country since the end of the genocide, is scheduled to make a speech at the Kigali Convention Centre.
He will then lead a vigil at the Amahoro National Stadium, which was used by United Nations officials to try to protect Tutsis during the killings.
Who is attending?
A number of foreign leaders are expected to be at some of the events. They are mainly African, although Prime Minister Charles Michel will represent the former colonial ruler, Belgium.
Paul Kagame (C) welcomes Ethiopia's PM Abiy Ahmed to the memorial events
French President Emmanuel Macron will not be there. This week he appointed a panel of experts to investigate France's role in the genocide.
France was a close ally of the Hutu-led government prior to the massacres and has been accused of ignoring warning signs and training the militias who carried out the attacks.
France will be represented by Herve Berville, a Rwandan-born MP.
Ugandan President Yoweri Museveni will also not be there. He has been accused of backing Rwandan rebels who oppose Mr Kagame.
Have your say
More World Headlines
- Joe Biden launches presidential bid
- Sri Lanka admits 'major intelligence lapse'
- Interpol rescues 157 child slaves in Benin, Nigeria
- Kim Jong-un visits Russia for summit
- Nigerian Labour Minister not worried about doctors leaving
- South Africa floods: Death toll after Durban rains rises to 60
- IS 'may be linked' to Sri Lanka attacks
- Children killed after car hits Easter parade
- Hatred of journalists turning to violence, watchdog warns
- Sri Lanka attacks: Mass funeral on day of mourning
- Innovative child malaria vaccine to be tested in Malawi
- Comedian who played President on TV to become Ukraine's President
- Grandma has arrived! Megan Markle's mother arrives in London ahead of birth of Royal Baby
- Sri Lanka attacks: 'International network' linked to deadly bombings
- More than 200 killed in Sri Lanka attacks