A gunwoman wielding two "assault-style" rifles and a pistol killed three pupils and three adults at a private Christian school in Nashville, Tennessee, on Monday, in the latest in a series of mass shootings in a country growing increasingly unnerved by bloodshed in schools.

A gunwoman wielding two "assault-style" rifles and a pistol killed three pupils and three adults at a private Christian school in Nashville, Tennessee, on Monday, in the latest in a series of mass shootings in a country growing increasingly unnerved by bloodshed in schools.