The search for a man missing from his home in Toodyay has been suspended after five days of investigations.
James Winston Harrison was last seen leaving his Toodyay home on Sunday, March 17 and has not been seen or heard from since.
Police advised on Friday afternoon that land searches have been suspended pending further information coming forward.
Toodyay Police officer in charge Sergeant Dave Flaherty said the search for James has been difficult because of a lack of clarity on where he went.
"Sadly there has been no indication of direction or area of where James could have gone," Sergeant Flaherty said.
"At this stage we are simply establishing where he could have gone.
"We've utilised as many resources as we can including the SES, the WA police mounted unit, police units on the ground, vehicle searches and we had the air wing out.
"We are out there overturning every rock and every leaf."
Sergeant Flaherty said there is no indication or reason that James would have left the Toodyay area.
The search area consists of a 5km radius of James' Toodyay home and a stretch of the Avon River up to Cobblers Pool.
Sergeant Flaherty said police are extremely concerned for James' welfare.
"There have been no phone calls," he said.
"There has been no contact with family or friends in any shape or form.
"There's been no sign of him.
"We are concerned for him and are going to great lengths to find him.
"We will continue to do so."
James is described as fair skinned, slim build, approximately 187cm tall with short brown hair.
He was last seen wearing red and black shorts, a singlet and grey and white sneakers.
Inquiries are continuing into the whereabouts of Mr Harrison and police ask anyone who sees him to please call 131 444.