A conflict between rebels in the Sudan province of Darfur and the Arab-dominated central government of Sudan has caused an estimated 180,000 deaths and displaced 2 million people, the Cincinnati Post reported.
"This is an ongoing and terrible story that we were able to see up close," Clooney told the newspaper. "These folks are helpless out there. There's nobody between them and very bad people."
Nick Clooney will be writing about the trip for the Post and George Clooney will appear on several television programs, the newspaper said.
They both plan to attend a "Rally to Stop Genocide" organized by the Save Darfur Coalition next Sunday in Washington.
"The reason we wanted to make the trip at this time was because of the demonstration on behalf of Darfur," Nick Clooney said. "We're hoping to be able to make this as timely as possible and raise awareness."