http://www.slate.com/articles/news_and_politics/jurisprudence/2015/10/gun_accidents_why_are_parents_who_leave_loaded_weapons_lying_around_never.html

Last week, in what’s actually become a pretty standard week in America, two young children shot two other children dead with unsecured guns. Nothing about this is a surprise, really—89 percent of unintentional shooting deaths of children take place in the home, when children are playing with a loaded gun while their parents are out. American children are 9 times more likely to be killed by a gun than are kids in other developed nations. There are more than 310 million guns in the United States, and more than 30 percent of Americans report that they have a gun in their home. Those guns are not always stored securely. A RAND Corporation study showed that about 1.4 million households (with an estimated 2.6 million children) had firearms stored unlocked and either loaded or with ammunition nearby.