https://www.washingtonpost.com/graphics/national/mass-shootings-in-america/

The death tolls change, the places change: Nine in a church, 26 in an elementary school, 49 in a nightclub, five in an airport. The faces in the memorial photos change every time.

But the weapons are the common denominator.

Mass killings in the United States are most often carried out with guns, usually handguns, most of them obtained legally.