|Famine in Somalia. Flickr/United Nations|
A two page summary of the study said a combination of events triggered the famine. First, the eastern Horn of Africa experienced the driest period in 60 years. Second, donors delivered a low amount of humanitarian aid in southern Somalia in 2010 and much of 2011. In many areas, conflict and insecurity impeded humanitarian aid and access. You can access the complete 87 page report titled "Mortality among populations of southern and central Somalia affected by severe food insecurity and famine during 2010-2012" by following the link in the summary.