Police officers in New Zealand perform a haka in memory of Sergeant Matt Ratana four days after he was shot dead inside a custody centre in London. The group of officers carried out the traditional Maori dance at Porirua College near Wellington following the shooting last Friday in Croydon, south London. Originally from Hawke's Bay, Sgt Ratana went to the UK in 1989 but he returned to New Zealand to serve in the police between 2003 and 2008.