After Sudanese militants take a lab, the WHO issues a "biological risk" warning, undermining a US-brokered truce.

The World Health Organization warned of a "huge biological risk" after Sudanese fighters seized the National Public Health Laboratory in Khartoum, as foreign nations raced to evacuate the country and violence punctured a fragile US-brokered ceasefire. Heavy clashes erupted between the Sudanese military and the Rapid Support Forces, the paramilitary group battling the army for control of the country, in the northern part of Khartoum state. The number of people killed in Sudan since violence broke out eleven days ago has reached at least 459 deaths, with at least 4,072 people injured. The WHO did not appoint blame for the lab seizure but said medical technicians no longer had access to the facility. Nima Saeed Abid, the WHO representative in Sudan, described the development as "extremely dangerous because we have polio isolates in the lab, we have measles isolates in the lab, we have cholera isolates in the lab." The WHO has reported that trained laboratory technicians no longer have access to the laboratory and that the facility has suffered power cuts, resulting in a risk of spoilage of depleting stocks of blood bags.

A medical source told CNN that the danger lies in the outbreak of any armed confrontation in the laboratory, which would turn the laboratory into a germ bomb. An urgent international intervention is needed to restore electricity and secure the laboratory from any armed confrontation. CNN has reached out to the RSF for comment.