'Kill or be killed': inside Australia's postcode gang wars

There's a turf war going on in suburban Australian streets, where teenagers say it's a case of kill or be killed. The violence is being fuelled by an extreme and disturbing form of rap, drill. Today, ABC Four Corners reporter Grace Tobin on her extraordinary access to the rival gangs, and how some teenagers are being groomed as foot soldiers for organised crime. Featured: Grace Tobin, reporter, ABC TV Four Corners With reporting by Mahmood Fazal, investigative reporter, ABC Background Briefing