Police are continuing to investigate a violent attack at the Hamilton Kmart amid growing concerns thieves are getting more brazen and aggressive. A video on social media shows two women who appear to be leaving the store without paying for handfuls of goods attacking security guards. One is pulling a female security worker's hair and refuses to let go - while another woman is lunging at bystanders and workers with what appears to be kitchen tongs. A male member of the public is trying to get the attacking woman to let go of the security guard. Gary Morrison is chief executive of the New Zealand Security Association. He talks to Lisa Owen.