the U.N. says Rwanda has sent thousands of its troops into Congo. Some 500,000 people fled their homes in eastern Congo as the rebels advanced on Goma, according to the U.N. refugee agency.

People attack the Rwandan Embassy in Kinshasa, Congo's capital, on Tuesday, as they protest the Rwanda-backed M23 rebels' advances into eastern Congo's capital, Goma. (Samy Ntumba Shambuyi/The ...