The World Health Organization is investigating "another cluster of illness" in northern Congo, as a deadly mystery disease spreads in the region.

The disease, which has infected more than 400 people and killed 53 within a few weeks, “poses a significant public health threat,” the World Health Organization said.

At least 60 people have died and over 1,000 more are sick from a deadly "unknown disease" spreading in a region of the Democratic Republic of Congo, the World Health Organization said. Local health officials in Congo are partnering with the World Health Organization to investigate.