Sam Woodhead will be taken to Longreach Base Hospital for a medical assessment, Queensland Police said.
The teenager's sister wrote on Facebook: "We have been told that they have found Sam!! We have no information on his condition or where he was found yet, so keep your fingers crossed."
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Two suspected illegal immigrants have been detained after one was spotted waving at motorists while sitting on the rear axle of a lorry.
Toronto Police will not charge two men who built a long tunnel through the city "for personal reasons."
More cold, wintry weather into March