Suspects filmed themselves laughing and joking in a car in Rio de Janeiro
Teen 'drugs gang' livestream their own deaths on Facebook when police helicopter opens fire on their car in Brazil
Suspects filmed themselves laughing and joking in a car in Rio de Janeiro, Brazil
Moments later, clip captures sound of gunfire coming from a police helicopter
It is thought three of them were killed while a fourth was injured in the shooting
Youths, who were live streaming their film on Facebook, were targeted during a crackdown on trafficking
