In Ohio, four people were injured and left hospitalized Monday evening after a man walked into a Walmart in the city of Beavercreek and opened fire with an assault rifle. Police say the shooter then died of an apparent self-inflicted gunshot wound. It’s the same Walmart store where in 2014 a 22-year-old African American man named John Crawford was shot and killed by a police officer after a caller phoned 911 to accuse him of brandishing a gun and pointing it at other customers. In fact, Crawford had picked up an unloaded BB air rifle on a shelf. The white police officer who fatally shot John Crawford was acquitted by an Ohio grand jury. According to the Gun Violence Archive, there have been over 600 mass shootings across the U.S. so far this year — a record pace.