Headquarters of the United Nations be sent by courier. The United Nations Postal Administration issues stamps, which must be used on stamped mail sent from the building. For award purposes, amateur radio operators consider the UN headquarters a separate "entity" under some award programs such as DXCC. For communications, UN organizations have their own internationally recognized ITU prefix, 4U. However, only contacts made with the UN Headquarters in New York, and the ITU count as separate entities. Other UN organizations such as the World Bank count for the state or country they are located in. The UN Staff Recreation Council operates amateur radio station 4U1UN,
United Nations Operation in Côte d'Ivoire international community and reiterated that UNOCI could use "all necessary measures" in its mandate to protect civilians under imminent threat of attack. Heavy fighting broke out on 31 March 2011 as forces of Alassane Ouattara advanced on Abidjan from several directions. The United Nations peacekeepers took control of Abidjan's airport when Gbagbo's forces abandoned it and United Nations forces were also reported to be carrying out protective security operations in the city. The UN peacekeeping mission said its headquarters were fired on by Gbabgo's special forces on 31 March, and returned fire in an exchange lasting about three hours. UN