A woman accused of running a concentration camp in Croatia during the Second World War has arived in Zagreb after being extradited.

The woman, Nada Sakic, faces charges including torture and collective punishment of civilians.

She's alleged to have run the women's section of a camp commanded by her husband -- who's also been extradited from Argentina -- between 1942 and 1945 when Croatia was controlled by a Nazi-backed regime.

Tens of thousands of Serbs, Jews, gypsies and anti-fascists were killed in concentration camps under the Ustashe regime.