The World Health Organization said Friday that Ebola now poses a “very high” risk, as a lack of medical resources and anger among the population hamper the response.

The outbreak has alarmed experts because it was able to spread for weeks undetected across a densely populated area ravaged by widespread armed violence.

The World Health Organization has stepped up emergency operations in eastern Democratic Republic of Congo after the country recorded 136 deaths and about 543 suspected Ebola…