Pointing to a scarred bald patch above his ear, Lise Dide shows where shrapnel grazed his head when his village in Sudan's Blue Nile state was hit in an air strike. 'The plane came when I was asleep. I was still in my bed, I did not hear the sound,' he said in South Sudan's Doro refugee camp, set up just three weeks ago some 40 km (25 miles) from the Sudanese border. Dide is one of more than 80,000 Sudanese that have sought refuge in South Sudan from clashes between government forces and insurgents on the northern side of the poorly-marked and tense border, according to the United Nations.