The UN Security Council has urged Khartoum to withdraw soldiers from the disputed oil region of Abyei, after northern Sudanese tanks entered the oil rich area.
The UN condemned the attack as the north accused South Sudan of targeting one of its military convoys on Thursday.
The South meanwhile says the North has been carrying out a bombing campaign in Abyei.
And as Nazanin Sadri reports, there are fears this latest escalation of could derail Sudan's peace agreement.
