After three days of scouring bushland north of Brisbane, police believe they have found the remains of missing 22-year-old Samuel Thompson.
The discovery follows murder charges laid against two men, including anti-Islamic State fighter Ashley Dyball.
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RAW VISION: Police discover suspected human remains at Caboolture in the search for missing Albion man Sam Thompson: NO SOUND. 7 News Queensland
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Remains found in search for Sam
RAW VISION: Police discover suspected human remains at Caboolture in the search for missing Albion man Sam Thompson: NO SOUND. 7 News Queensland
Detective Inspector Tim Trezise said dog squad officers found "a grave site" on Monday morning about 300 metres into Beerburrum State Forest at Caboolture, about 50 kilometres north of Brisbane.
"Whilst it is too early to say whether this is connected to Sam's disappearance, we're optimistic that it may in fact be Sam's body," he said.
Inspector Trezise said Mr Thompson's family had been told about the discovery.
"It gives them some comfort that we may have, in fact, found Sam's body," he said.
Inspector Trezise said police became aware of the area off Pumicestone Road on Friday night and began searching on Saturday morning, with the search area spanning about one square kilometre.
Scientific officers were working on Monday afternoon to exhume the remains and collect evidence, which was expected to stretch into the night.
Before police began searching the forest, charges had already been laid against two Brisbane men over the killing of Mr Thompson.
Roberto Vincenzo Boscaino, 23, was charged on Thursday with murder and interfering with a corpse.
Anti-Islamic State fighter Ashley Dyball was arrested on Friday, and also charged with murder and interfering with a corpse.
The 25-year-old Mr Dyball, of Albany Creek, appeared in Brisbane Magistrates Court on Saturday, and his matter was adjourned until May 15. Mr Boscaino's matter was adjourned until May 8.
Mr Thompson was reported missing by his parents on March 7.
Police had previously searched Swanbank Landfill, about 45 kilometres south-west of Brisbane, as well as Nudgee Dump, about 20 kilometres north-east of Brisbane. However Inspector Trezise said they were "mostly unsuccessful".
A Bald Hills home was also earlier declared a "primary crime scene" by police.
Mr Thompson had been the victim of an unsolved robbery in September last year, and police were investigating any links between that crime and his death.
The investigation into the disappearance of Mr Thompson was described as "difficult with many challenges". Inspector Trezise said detectives had left no stone unturned and they had achieved "tremendous results to this point".
At any given time, at least 50 detectives had been working on Mr Thompson's case and police said they did not expect more charges to be laid.