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    Video shows kids flee through woods during Nashville shooting

    00:42
  • Nashville shooter messaged former teammate prior to attack

    02:55
  • Police officer killed, second wounded in Alabama shooting

    02:11
  • Police say Nashville school shooter bought 7 guns legally

    02:56
  • Full bodycam: Nashville police encounter school shooter

    01:36
  • Bodycam footage shows Nashville police respond to school shooting

    02:54
  • Nashville GOP Rep. Ogles defends 2021 family photo with guns

    00:09
  • How to spot the warning signs of a potential mass shooter

    04:30
  • Reporter recounts surviving 2010 shooting while covering Nashville shooting on-air

    02:30
  • U.S. and Mexico weigh agreement on fentanyl and guns

    02:28
  • Police say Nashville school shooter was a former student

    01:09
  • Highland Park survivor speaks out on Nashville shooting after news conference

    01:06
  • Police: At least 7 dead in Nashville school shooting

    02:09
  • Emotional parent describes hearing news of Tennessee school shooting

    01:13
  • Three children dead after school shooting in Nashville

    02:03
  • Twitter bots advertising guns to users tweet using trigger terms

    03:03
  • Police: Two staff members wounded in shooting at Denver high school

    01:31
  • Student killed in Texas school shooting, suspect in custody

    02:06
  • Two wounded in shooting at Texas high school, suspect in custody

    01:33
  • Four teens arrested in house party shooting near Atlanta that killed 2

    01:30

Inside look at the rising 'ghost gun' market in the U.S.

06:25

NBC News' Vaughn Hillyard takes an in-depth look into the surging "ghost gun" market in America. The untraceable firearms are built from easy-to-use kits that can be bought online or at a gun show.