text: Water police have been called in to help with the search of a missing autistic boy, as 11-year-old Luke Shambrook is 'fascinated' by water but can not swim. Luke has been missing for two nights in a Victorian national park, with temperatures dropping to as low as eight degree Celsius on Saturday night. However, he may not even know he is lost and is known to frequently hide, according to his family. He was last seen leaving Candlebark Campground in Fraser National Park near Lake Eildon at 9.30am on Good Friday. According the Herald Sun, the 11-year-old was reportedly seen walking near the Devils River on Sunday, four kilometres south of his campsite where he was last seen. Search crews have rushed to the location and police remain comfortable that the young boy is still alive. Luke has limited speech and his family says he is probably confused, and he may not even be aware he is lost. Campers are helping rescue teams including the air wing, dog squad, local police and SES volunteers in the search of thick bushland. Scroll down for video . Luke Shambrook was last seen on the national park at 9.30am on Good Friday. It is understood he wandered off and has not been seen since . Police assume Luke has spent 36 hours without food or water and on Saturday night would have experienced temperatures as low as 8 degree Celsius. Police hold hope that Luke has been able to stay reasonably warm as he was last seen wearing a beanie and warm jacket. There was a moment of hope when a beanie was found by the search party, however it was decided it did not belong to Luke. Having met Luke's family during a push to open a special school in Melbourne's southeast, Opposition emergency services spokeman Brad Battin says it's devastating to hear the 11-year-old is missing. He says Luke's parents Tim and Rachel have been updating him on the search and appreciate the efforts of all those out looking for their little boy. 'He's a lovely young kid,' Mr Battin told AAP on Sunday. 'He displays all the characteristics of a child with autism, which means he might not even think he is lost.' Sergeant Greg Paul says the search is focused on an area of several kilometres of bushland. The Candlebark Campground in Fraser National Park, central Victoria, where Luke went missing on Friday . 'We've got a lot of searchers in the bush, we've got a lot searchers searching all the tracks and in between the tracks and the gullies and the spurs,' he told reporters on Saturday. The Shambrook family has thanked emergency service workers, volunteers, family and friends for their help. They say the disappearance is completely out of character for him. A widespread search is being carried by search and rescue teams including the air wing, dog squad, local police and SES members, along with campers around the surrounding areas. A large search is being carried by a medley of search and rescue teams . Sergeant Greg Paul said the search was focused on an area of several kilometres of bushland. 'We've got a lot of searchers in the bush,' he told reporters on Saturday. 'We've also got people walking the banks of the lake.' But he outlined a serious hurdle for the search efforts, according to ABC. 'With the autistic condition, Luke might not respond to searchers, he may not even know that he's lost,' he said. 'He won't necessarily respond to his name being called, but that might change a little bit as he gets hungry maybe. Lake Eildon, near where Luke went missing: Police say conditions are favourable for his survival overnight, with warm temperatures through the day . Sgt Paul said there were hundreds of other campers in the area over the busy Easter period, so there was a chance someone else could spot Luke. Luke is described as being of medium build, about 150 cm tall with olive skin, brown hair and brown eyes. He was last seen wearing a black windcheater, black t-shirt, grey track-pants, grey boots and a scarf. Sergeant Greg Paul said the search was focused on an area of several kilometres of bushland . Searchers are desperately combing bushland and the banks of a lake for an autistic who went missing there . A widespread search is being carried by search and rescue teams including the dog squad and local police .
target: Luke Shambrook was last seen leaving Candlebark Campground on Friday .
  The 11-year old was camping in the Victorian national park with his family .
  He has been missing for two nights and temperatures dipped to as low as eight degrees Celsius on Saturday night .
  There has been an unconfirmed sighting of Luke with police acting quickly .
  The 11-year-old was reportedly seen walking 4 kms from his campsite .
  Luke has limited speech and his family says he is probably confused .
  A large search is being carried by a medley of search and rescue teams .
  Police also said conditions are favourable for his survival overnight .
  They have issued an extensive description of Luke and his clothing .