"Underscoring the severity of the situation, U.N. humanitarian chief Baroness Valerie Amos arrived in Goma on Tuesday and is to visit some of the 280,000 people who have fled their homes since mutinying soldiers launched the M23 rebellion in April. But security is so poor that Amos was forced to cancel planned trips to the mining town of Walikale and the seat of the rebellion in Rutshuru, 75 kilometers (50 miles) north of Goma."