Family of missing George Town man Austin Giles have pleaded for anyone who knows anything to come forward and contact police.
North-East Inspector Ruth Orr said the 19-year-old, last seen on Tuesday, was believed to be wearing a black puffer jacket, black track pants and white sandshoes.
Austin's father, Darryn Giles, said the past week had been life-changing for his family.
"My son is still out there missing. It's numbing. It's been very difficult and hard for me and my [other children]," he said.
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One of Austin's older brothers, Damien Giles, said the family had remained strong, but no one knew how to deal with the situation.
He said they just wanted to know Austin was safe.
"That's all we need to know. He needs to contact someone and let them know he is OK. We just want to show Austin that we love him and we want him to come home."
It is believed Austin left the house on foot, but the family are unsure of which direction he took.
"Any information of where he might have been heading [would help]. We are baffled with which direction he went," Damien said.
"When he walked out of here he went somewhere, we just need a sighting confirmed of which direction he went."
Inspector Orr said police had received quite a bit of information in regards to potential sightings of Austin, and were waiting on phone and bank records.
"We are in the process of working through that information," she said.
"[However], there are no strong leads in relation to the information we are working through. At this point in time we don't know where Austin is unfortunately."
Police, search and rescue, and SES conducted ground and air searches from Tuesday through to Thursday.
"We would need some sort of more recent specific information ... to coordinate ground searches in the next couple of days," Inspector Orr said.
On Saturday, family and friends joined police efforts and held their own search party covering a five-kilometre radius from the house.
"It's been mind-blowing, and emotions-wise heartwarming. The compassion of people, in George Town has been absolutely incredible at a time of crisis," his father Darryn said.
For anyone wanting to help in the search of Austin, a Facebook page has been created - Austin Giles Support Page.
Inspector Orr said there was nothing to indicate suspicious circumstances in relation to Austin's whereabouts.
Austin's mother, Louise Gibbons, described her son as being bright, vibrant, and having a big-heart.
As of Sunday, Austin was still missing.
If anyone has information about the whereabouts of Austin, or have had contact with him, contact police on 131 444.
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