Depending on whom you ask, there have been 353 mass shootings in the United States this year, or four. Or some other number in between.
How can the figures be so far apart?
A mass shooting would seem to be self-evident. But with the highly politicized debate over gun control, and no fixed standard, there's an ongoing battle over the definition. Some say mass shootings are soaring, while others point to numbers suggesting they have been at roughly the same level for years.