Half a million people in Sudan could face a famine by March if international humanitarian organizations are not allowed to enter the country, U.S. envoy to Sudan Princeton Lyman warned Wednesday.

A malnourished Sudanese child sits on a woman’s lap at a nutrition and feeding center in Sudan. (Hannah McNeish/AFP/Getty Images)

“There is a looming humanitarian disaster in Sudan,” Lyman said in Pretoria Wednesday, in a speech designed to drum up support for African intervention in Sudan. “Africa needs to speak with one voice. Africa needs to say, ‘We cannot allow this to happen.’”

More world news coverage:

- Haiti’s former dictator lives in style

- Dilemma for China’s one-child generation

- Did U.S. radar fry Russian Mars probe?

- Read more headlines from around the world