It's understood there are three main crocodiles known to frequent Mowbray Creek, although wildlife tour managers say much larger crocs could easily have travelled there from neighbouring inlets.
A search and rescue team has found clothing, a walking stick, and "biological matter" suspected to be human remains near a crocodile-infested creek in Port Douglas, north of Cairns.
"It is my deep regret to inform that following an extensive search and the discovery of certain items as a result of that search, we have the firm belief that my mother Anne Cameron has passed away in tragic circumstances", Eggins said.
Anne Cameron, 79, was reported missing from an aged care facility near Port Douglas, north of Cairns, on Tuesday.
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Friday is also the last day applications can be sent to change a voter's party affiliation to vote in the 2018 primary election. Qualified Virginia voters may now vote absentee in-person at their local voter registration office or vote absentee by mail.
'We believe she's wandered in there and gotten lost, it's our theory that she's become disorientated and walked through that area'.
Acting Inspector Lukin said given the proximity of the clothes and remains, police could not rule out the possibility of a crocodile attack.
"We would like to sincerely thank the police, SES, fire brigade and everyone in the Port Douglas community who helped us in the search for Anne".
Her disappearance has sparked renewed calls for a crocodile cull.
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State Emergency Service area controller Sean McGuinness said the search is proving to be hard.
He said Department of Environment and Heritage Protection officers would patrol the area tonight "in the event that there has been a croc involved in this missing person".
Her granddaughter Isabella Eggins posted on social media late yesterday, saying the family believed she had died "in tragic circumstances".
Members of the public in the area are being asked to check their property for any signs of her. "Police hold grave concerns for her well being due to her medical condition, her age, the length of time that she's been missing and the increasing temperatures", authorities said in a statement on Thursday.
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