The Rwanda-backed rebels who captured eastern Congo 's key city of Goma sought to reassure its residents Thursday, holding a stadium rally and promising safety under their administration as they try to shore up public support amid growing international pressure.

DR Congo requested the urgent meeting of the UN's top rights body to discuss escalating fighting by Rwanda-backed armed group M23 in North and South Kivu provinces, and drew up a draft resolution that would set up the probe.

Residents of Goma reported gunfire and shelling after rebels overran Congolese troops. U.N. officials estimated that more than one million displaced people were now inside the city.