The top U.N. humanitarian official in Somalia on Monday strongly condemned the attack against the world body's aid compound in southern Somalia on Sunday, the fourth time in two months that the United Nations' offices in the Horn of Africa nation have been deliberately targeted. Armed gunmen carried out the attack around midnight on Sunday at the World Food Program (WFP) compound in Wajiid, according to a statement issued by the Office of the U.N. Resident and Humanitarian Coordinator for Somalia. The attack came less than one month after Somali militants raided two U.N. compounds Baidoa and Wajiid, stealing equipment and vehicles and forcing the organization to close down one of its operations in the strife-torn nation. “This direct, deliberate and sustained attack on aid organizations and aid workers is intolerable,” acting U.N. Resident and Humanitarian Coordinator Graham Farmer said, urging all parties to allow unhindered access for aid workers assisting those in need. The United Nations has repeatedly called on all parties in Somalia to ensure the safety of humanitarian aid workers, who are tending to the needs of some 3.2 million people, or 40 percent of the population, made vulnerable by the combined effects of conflict, drought, high food prices, and the collapse of the local currency.