In the past 10 days, officials have recorded nearly 100 new cases, and the outbreak has reached 2,265 infections.
Officials have now confirmed 3 recent cases in Bunia, population 366,000.
The WHO reports a worrying spike in activity in Mabalako, one of the smaller hot spots, as cases top 2,200.
With 13 new cases today, the DRC outbreak has reached 2,181 infections, 1,459 deaths.
With 48 cases in 3 days in the DR Congo, totals have grown to 2,168 cases, including 1,440 deaths, for a 66% fatality rate.
The panel expressed serious worry over the threat to the region and over funding.
The grandmother of the 5-year-old boy identified in Uganda has also died, and the family cluster is at 8 cases.
A boy confirmed infected yesterday in Uganda has died, and 2 relatives have Ebola.
The patient is 5, and at least two of his family members also have Ebola symptoms.
The outbreak has now reached 2,062 infections, with deaths climbing to 1,390.
