(UN News Centre) – Urgent humanitarian assistance is needed for some 100,000 people trapped in the South Sudanese town of Yei, where the security situation deteriorated rapidly after renewed conflict broke out in Juba, the capital, in early July, the United Nations refugee agency warned today. “Until now, Yei has been largely spared from the violence and attacks that have plagued the country since December 2013,” William Spindler, a spokesperson of the Office of the UN High Commissioner for Refugees (UNHCR), told reporters in Geneva.