00:30BBC Wales InvestigatesGangs, Murder and Teenage Drug RunnersBBC One Wales Duration: 1 hour Mon 4th Jun 2018, 00:30 on BBC News Channel HDAs street gangs move into Wales, the programme speaks to those involved and follows the police as they tackle a growing threat.ContributorsReporter:Wyre DaviesProducer:Rhidian ThomasGenresFactualCrime & JusticeFormatsDocumentariesBrandBBC Wales Investigates Source: BBC Online