Mystery still surrounds the serious assault at Arthur River on the state's West Coast more than two days ago.
A 47-year-old Arthur River man is in hospital with serious head injuries after the assault, reported to have happened at about 2am on Saturday.
He was transferred to the Royal Hobart Hospital after initially being taken to Burnie's North West Regional Hospital.
He was yesterday listed as being in a critical but stable condition in the intensive care unit. Police have not released his name.
They have also not released any information about details of the assault, or if they are searching for an offender, as they continue their investigations.
A crime scene was established by police on Saturday, with police personnel remaining at the scene for the best part of both Saturday and yesterday.
It was an ``unusual event'' for the usually quiet holiday spot, police said.
Detective Sergeant David Chapman said in a police statement that investigations were ongoing, which included speaking to Arthur River residents.
``I can indicate that due to the assistance of a number of local residents we are following a specific line of inquiry,'' he said.
Officers from Smithton Police Station, along with Western detectives from Devonport and Burnie, are conducting the investigation.
Any person who may have any relevant information is asked to contact Smithton Police on 6452 5099, Western CDI in Burnie on 6434 5291 or Crime Stoppers on 1800 333 000.