Amnesty International said it interviewed internally displaced people from South Kordofan in southern Sudan. They said villages were attacked by the Sudanese military from June to December, though there were no military or rebel targets in the area.
"The armed conflict in Sudan's Southern Kordofan between the Sudanese government and armed opposition group, the Sudan Peoples' Liberation Army-North, continues unabated, and to the detriment of the civilian population," Amnesty International said.
An Amnesty International report said the group reviewed documentation from Sudanese human rights monitors that say more than 200 bombs were dropped on South Kordofan in November.
Sudan and South Sudan have struggled with security measures since a 2005 peace agreement ended civil war. South Sudan in 2011 became an independent country as part of that deal.
The U.S. State Department this week issued an alert to U.S. citizens warning of the risks present in South Kordofan and Darfur regions of Sudan.
"While the government of Sudan has taken some steps to limit the activities of terrorist groups, elements of these groups remain in Sudan and have threatened to attack Western interests," the warning reads.