Genocidal fighters just overran El Fasher, the capital of North Darfur. After more than 500 days of siege and starvation, the city has fallen. Now, civilians — families, children, journalists — are trapped, terrified, and at unimaginable risk.

No one is safe: a former female MP was just executed, a prominent journalist has gone missing, and people are being executed in the street, with blood drenching the ground from executions visible from space. An enormous push to key politicians could help stop history repeating itself: Wave after wave of ethnically driven massacres as the world watched in silence.

So let's be fast: The US and UK Foreign Secretaries both have leverage they could use to immediately call out the fighters' backers, fund life-saving aid, and to push for accountability for war crimes in Darfur. But to act they need to feel personally responsible. Sign now to help keep all eyes on Sudan. Every hour counts, let's demand action before the killing ramps up further.