The BBC obtained its evidence for an episode of "Panorama" to be broadcast Monday.

"China's Secret War" claims China exported Dong Feng military trucks to Sudan in 2005. A BBC news team tracked one truck deep in the desert, where it was in the hands of a rebel group that reportedly captured it from the government.

Rebels gave the BBC film of a second truck. Both trucks were equipped with Chinese-made anti-aircraft guns.

The BBC said it also had evidence obtained from satellite photographs that two Chinese-made Fantan fighter jets were based at Nyala Airport in South Darfur earlier this year.

An estimated 300,000 people have been killed in Darfur and 2 million turned into refugees.