KHARTOUM (AFP) - Embattled fighters in north Sudan's flashpoint state of South Kordofan claimed on Sunday they had shot down two northern army planes, and said the conflict had so far displaced 75,000 people. UN chief called for an end to the conflict in central Sudan, saying in a statement that he was "alarmed at the deterioration of the security situation and escalation of fighting" in the heavily armed northern state. "On Friday, our troops shot down two SAF planes. One was an Antonov bomber in Kalkul and the other was a MiG Joint-3 in Kauda," said , a media adviser.