Amnesty International says it has "definitely confirmed" that Sudanese government forces committed war crimes against civilians in the South Kordofan region.

The report released Tuesday says Sudanese warplanes dropped more than 374 bombs on 60 locations under control of rebel group Sudan People's Liberation Army-North, which along with ground shelling killed at least 35 civilians between January and April 2015.

Amnesty says government forces bombed at least 26 health facilities since 2011, "some of which were clearly identified with flags and crosses on their roofs."

Rebels in South Kordofan, along the border with South Sudan, are fighting the central government.

Sudan's President Omar al-Bashir is wanted by the International Criminal Court for war crimes allegations linked to the conflict in Sudan's Darfur region.