NSW govt cautious on Mardi Gras brutality The NSW government has asked the public not to judge claims of police brutality at Sydney's Gay and Lesbian Mardi Gras until after police complete an internal inquiry. Demands arose for an investigation independent of police after a video emerged of 18-year-old Jamie Jackson being thrown to the ground by an officer while handcuffed at the festival about 11.30pm (AEDT) on Saturday. Later, Bryn Hutchinson, 32, came forward to say he had been thrown to the ground by officers at the corner of Oxford and Crown streets in Darlinghurst. Mr Hutchison said police asked him not to cross the road about 11pm (AEDT). But he did so, and attempted to "negotiate" with officers because he believed there was no vehicle traffic on the street. NSW Assistant Police Commissioner Mark Murdoch said police were investigating two incidents in which two people had been charged. "While two incidents is still two too many, in the grand scheme of things we don't have a super big problem," he told reporters. NSW Premier Barry O'Farrell said he was confident a police investigation would "get to the bottom of what went on," and Police Minister Mike Gallacher said oversight from the ombudsman meant no additional investigation was necessary. "I'm satisfied the ombudsman is independent, is truly independent of the NSW Police Force," he told reporters on Wednesday. Mr O'Farrell and Mr Gallacher said it was prudent to wait until the inquiries had finished before making any judgment about police conduct. NSW Police Association president Scott Weber, a serving officer, said an internal investigation was appropriate as NSW police were subject to more oversight than any other force. At least six officers were involved in the arrest of Mr Jackson, described by the Greens and lobby group GetUp! as "disturbing." In the video, an officer is seen to throw the handcuffed man to the ground before standing with one foot on his back for at least 20 seconds. The initial encounter between the young man and officers was not shown. A woman can be heard saying, "This (officer) here grabbed him by throat and smashed his skull on the pavement." Another woman, who appears distressed, says, "They just slammed his head, there's blood all over the ground." Mr Murdoch said the video showed only part of a larger incident and the full circumstances would be revealed later. Shortly after midday on Wednesday, an online petition started by GetUp! received 5208 signatures from across Australia calling for a pubic inquiry into the incident. Greens MP Cate Faehrmann has called for an independent inquiry. "We need to restore trust in a community that will be upset and scared," she said. Mr Jackson's father, Stephen Reed, said his son was "a good kid." "He's not a big boy and seeing him being thrown around like a rag doll and (police) stepping on him too, I'm still a bit shaken up by it," he told News Ltd. The openly gay independent MP for Sydney, Alex Greenwich, said he was "shocked and distressed" by the footage. Mr Greenwich and co-chair of the Sydney Mardi Gras Peter Urmson were meeting with Mr Gallacher on Wednesday. About 1000 extra officers patrolled the event, which was attended by 10,000 participants and supporters.