There have been many mass shootings and several bombings that have received considerable attention from the media. A few are mentioned here.
In a Century 16 theater in the Town Center at Aurora, Colorado, on July 20, 2012, a shooter killed ten people and wounded many others, including two who died later in hospital. James Eagan Holmes, the man charged with this crime, had acquired hundreds of 12-gauge shotgun shells and thousands of rounds of ammunition for handguns and semiautomatic rifles in a few months before the massacre.