A Lufthansa cargo plane has crashed at King Khaled International Airport in the Saudi capital, Riyadh, Saudi state television reports.

There were no casualties on the German-owned plane, the kingdom's civil aviation authority said.

But the plane's two pilots were being treated in hospital, Lufthansa said in a statement quoted by Reuters.

The Saudi civil aviation authority has been trying to put out a fire on the plane, reports said.

"The firefighters are containing the fire," said a spokesman for the General Authority of Civil Aviation.