WARNING: TRAVEL IN THE US AT YOUR OWN RISK This graphic shows the Mass Shooting/Killing incidents since President Barack Obama took office in January 2009. The shooting at the Navy Yard in Washington, D.C., on Monday marks the 20th time since Barack Obama took office that there has been a mass killing incident. Using data compiled by Mother Jones magazine, we created an animated map to show, month-by-month, what that toll looks like. According to that data, 174 people have lost their lives since January 2009 in such incidents. The incidents must meet several criteria: four or more killed, it must have been [...]