A gunman opened fire Monday morning in a bank in Louisville, Kentucky's main city, killing at least four people and wounding at least six before being shot. "The lone gunman is dead," police wrote on Twitter, after saying he had been "neutralized" This is the second shooting in just two weeks.

The United States is paying a very heavy price for the spread of firearms on its territory and for the ease with which Americans have access to them. One in three adults owns at least one weapon and nearly one in two adults lives in a household where there is a weapon.