New satellite photos show the government of Sudan preparing a full-scale attack on its own people.
Human rights groups say some of those images show Sudan's military moving into position, preparing to attack along the border between North and South Sudan.
Sudan has already bombed the Nuba people near the new southern border.
Now Sudanese forces have cut off the main evacuation routes for refugees trying to flee the region.
Many of the Nuba people sided with the southern rebels and wanted to be part of the new breakaway country of South Sudan, but the Sudanese government wouldn't let them. The Nuba Mountain region remains a part of North Sudan.
U.S. and other Western officials believe new attacks along the border by the north Sudan military could ignite a war with South Sudan.
"We warned the world, 'The government of Sudan is poised for assault,'" Jonathan Hutson, a spokesman for the Enough Project, one of the groups that is part of the Satellite Sentinel Project, told the Los Angeles Times.
"Six weeks later, they did what we predicted. The world failed to heed our warning." This time, he said, "there's a chance to save hundreds of thousands of Nuba lives if the world will simply pay attention."
The satellite monitoring project was the idea of actor George Clooney, who said that if he couldn't get away from the paparazzi's cameras, neither should the Sudanese government.
The International Criminal Court is using images gathered by the group as evidence of possible war crimes by Sudanese officials, Time Magazine reported in December.
Sudanese President Omar Hassan Ahmed Bashir has already been charged with war crimes in connection with the devastating conflict in the Darfur region.
This story was originally published on Friday, January 27th.