Thousands of civilians have been massacred by the regime’s soldiers in the past 11 years as global powers continue to turn a blind eye.
The massacre, one of many targeting Mayan communities during the civil war, occurred on May 21, 1988, in the remote Chiul indigenous community.
"Just because history is silent, it does not mean that it did not take place," says Joe Biden, who became the first sitting US president to visit the site in Oklahoma state where hundreds of Black Americans were killed by a white mob 100 years ago.
The Ethiopian army killed 15 people, and kicked their bodies down a cliff in Tigray, an investigation finds.
Human Rights Watch says Eritrean troops shot dead "over 200 civilians" on November 28-29 alone, making Axum massacre in Tigray region one of the deadliest atrocities of the conflict so far.
"We ask international partners, especially the African Union and regional partners, to work with us to address the crisis in Tigray, including through action at the UN and other relevant bodies," US Secretary of State Antony Blinken said.
The UN human rights chief Michelle Bachelet expresses "increasing alarm" at violence in Ethiopia's Tigray region and says an alleged massacre there might amount to war crimes.
Bosnians commemorate victims of the Srebrenica genocide, where at least 8,000 mostly Muslim men and boys were chased through woods in and around Srebrenica by Serb troops in 1995.
Twelve students and a teacher were killed on April 20, 1999, when two teenagers armed with an assortment of weapons and home-made bombs went on the rampage at the school, whose name has become synonymous with school shootings.
More than 8,000 Bosnian Muslim men and boys were killed after Bosnian Serb forces attacked the UN "safe area" of Srebrenica in July 1995, despite the presence of Dutch troops tasked with acting as international peacekeepers.
Robert Bowers, 46, an avowed anti-Semite, appeared defiant and determined in court.
In the early 1980s, Zimbabwe's former leader Robert Mugabe's notorious Fifth Brigade troops, trained by North Korean advisers, cracked down on the Ndebele ethnic group in response to a supposed rebellion.
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