Image caption Matthew Cassidy caught on CCTV inside Wok & Go There is rising violence in towns across Wales as drug gangs from the UK's big cities fight for control of the market. BBC Wales Investigates has discovered there are now thought to be over 1,000 so-called County Lines drug networks across the UK - a four-fold increase in four years - recruiting children as young as 13. So why is Wales being hit so hard?