First they killed the adults.

“Then they piled up the children and shot them,” a witness told Human Rights Watch. “They threw their bodies into the river.”

That’s a scene from a humanitarian crisis happening now in Sudan that has been overshadowed by Gaza and Ukraine and may be about to get far worse. It’s a conflict, by some accounts a genocide, unfolding particularly in the Darfur region there.

You may remember Darfur: It was the site of a genocide two decades ago. Those atrocities galvanized a vast response, led by protesters across the United States. Barack Obama and Joe Biden, then senators, were among those who called for action, and they were joined by tens of thousands of high school and college students, plus activists from churches, synagogues and mosques working together.

While hundreds of thousands were slaughtered in Darfur at that time, the campaign also probably saved the lives of hundreds of thousands of others. Other countries imposed sanctions and an arms embargo, peacekeeping forces were established by the African Union and the United Nations, and the Sudanese leader who commanded the genocide was eventually ousted.

Yet today the slaughter in Darfur is resuming — and the international response is not. Most Western nations and African ones alike have been fairly indifferent.

“The inaction pales in comparison to the situation 20 years ago, when global leaders felt morally and legally obliged to act on Darfur,” Human Rights Watch noted in a new 228-page report.