Lukin said police believed Cameron had wandered into the dense bushland, where she became lost, but it was not known if she had entered the water.
The 79-year-old, who has Alzheimer's disease, was last seen before she left her OzCare aged care facility to take a walk on Tuesday afternoon.
What is believed to be human remains have been found near a crocodile-infested creek in far north Queensland as police search for a missing elderly woman.
Police later found clothing, a walking stick with her name and human remains beside a crocodile-infested creek near Four Mile Beach, about a mile from the aged care facility.
Her disappearance sparked a widespread search, as she suffered from dementia and had wandered away on a previous occasion.
Lukin says the remains are expected to be confirmed as human by pathologists in Cairns on Friday.
"We continue to search the area in the hopes that we find her alive".
"We continue to search the area in the hope of finding her alive (but) because of the proximity of these items near the creek bank, we can not rule out the possibility of a crocodile attack".
State Emergency Service area controller Sean McGuinness said the search is proving to be hard.
A former neighbour of Mrs Cameron said she had moved to Port Douglas from Canberra, where she had lived most of her life, within the previous year in order to be closer to her family.
The Department of Environment and Heritage Protection said wildlife officers were assisting police with the search for a crocodile in the area. One fellow resident of Cameron's care facility told ABC she had seen the missing woman walking towards an administration building around 4pm on Tuesday (10 October).
Ms Wright said she was very upset when she heard Ms Cameron was missing.
"She's only been here eight or nine days".