The United Nations has declared a famine in two areas of southern Somalia as the region suffers the worst drought in more than half a century. The UN said the humanitarian situation in southern Bakool and Lower Shabelle had deteriorated rapidly. It is the first time that the country has seen famine in 19 years. Meanwhile, the UN and US have said aid agencies need further safety guarantees from armed groups in Somalia to allow staff to reach those in need. Lisa Mullins talks with Justin Kilcullen, director of the Irish aid group Trocaire