According to UsMagazine.com, Clooney, 46, said he was was mugged at gunpoint while going through a checkpoint during a recent trip to southern Sudan.
"There were all these young kids with AK47s," Clooney told British men's magazine Zoo Weekly. "They pointed guns at us and stole what they could. It happens all the time."
Clooney was named an official U.N. peace envoy in January. He took on the job of promoting the world body's peacekeeping missions after waging his own campaigns for an end to the 4 1/2-year war in Darfur and for more humanitarian aid for the millions caught up in the conflict.
He is a co-founder of Not on Our Watch, a humanitarian group that focuses global attention on Darfur's people and has raised more than $9.3 million for the region.