Gunmen have attacked a compound of the UN High Commissioner for Refugees in southern Sudan, killing one person and critically wounding two others. One of the gunmen was killed and the other was captured in the Wednesday night raid in the town of Yei, the UNHCR said on Thursday. The gunmen, who broke into the compound, killed one of its Sudanese guards. They also shot a foreigner working for the UNHCR in the stomach and a second local guard in the leg, the statement said.The staffer and the guards, who were flown to Juba, the main city in southern Sudan, early on Thursday are in critical condition in the local hospital. The agency plans to fly the wounded to Nairobi, Kenya, for further medical treatment.