US President Barack Obama has called on the leaders of northern and southern Sudan to stop the fighting, as conflict in disputed border areas threatens the peace agreements.

Kouider Zerrouk, spokesperson for the UN mission in Sudan who is based in Khartoum, describes the "ongoing bombardments."

Sudan expert Douglas Johnson, author of The Root Causes of Sudan's Civil Wars, looks at the crisis unfolding in the region, which has now forced thousands of people to flee.

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