Foul play is suspected in the disappearance of a 24-year-old Tasmanian man as police continue to hold two people in custody and search for a car linked to the case.
Jake Daniel Anderson-Brettner was last seen driving his 2011 Nissan Navara ute in Launceston on Wednesday night before it was found in the suburb of Riverside the following afternoon.
A 26-year-old man and 25-year-old woman have been taken into police custody but no one has been charged.
"Police hold grave concerns for the welfare of Jake Anderson-Brettner and while we hope to find him alive and well at this stage of the investigation we can't rule out that foul play may be involved," Detective Acting Inspector Craig Fox said in a statement on Sunday.
Anyone who saw a white 2006 Mazda 6 registration FN2477 in the Launceston area, particularly around Riverside, is urged to contact Crime Stoppers on 1800 333 000.
Detectives also want people who saw the 24-year-old's ute, as well as a black 2015 Range Rover Evoque or a black 2016 Jeep Cheroke, around Riverside or West Tamar between Wednesday night and Thursday afternoon to come forward.
"Police have these three black cars but their movements and the current location of the white Mazda may provide vital information in relation to Jake's movements," Inspt Fox said.
© AAP 2018