Police in Malaysia have said they have received no positive leads in the search for missing Irish girl Nóra Quoirin.
As the search for the 15-year-old entered its fifth day, Malaysian officials played recordings of the Franco-Irish teenager's mother over megaphones.
Nóra, who has special needs, went missing last Sunday shortly after arriving with her family for a holiday in a rainforest resort south of Kuala Lumpur.
Tribespeople specialised in tracking also joined the hundreds-strong search team as they trekked through the jungle shouting her name.
Nóra's London-based family believe she was abducted, but police have classified it as a missing person case.
Nóra's mother is from Belfast and her father is French and it is understood she travelled on an Irish passport.
The search team used a recording of Nóra's mother Meabh calling her name in the hope that a familiar voice might draw her out if she is in the jungle.
"This morning when we went out, we played the recording using loudhailers," Mohamad Mat Yusop, police chief of southern Negeri Sembilan state, told reporters.
Voices of other family members had also been recorded and would be used, he said.
Police say they believe Nóra is still in the area of jungle where the search is focused.
A helicopter with thermal imaging equipment is being deployed, joining the 267 people, divers, drones and sniffer dogs already involved in the search.
- Nóra Quoirin's parents 'devastated' by teenager's disappearance in Malaysia
- Nóra Quoirin disappearance - what we know so far
- Malaysia police widen search for missing Irish teen
- In Pictures: The search for Nóra Quoirin
Nóra's family say it would be extremely unusual for her to have wandered off on her own.
While officially treating it as a missing person case, police say they have not ruled out any other possibilities.
They have questioned around 20 people and are examining fingerprints found on a window where the family were staying at The Dusun resort.
"We ask everyone to keep Nóra in their thoughts, and to continue to support the ongoing search for her," said her aunt Éadaoin Agnew, in a video released by charity, the Lucie Blackman Trust.
"Nora is still missing, and she is very vulnerable, and we need to do everything we can to bring her home."
Speaking from Belfast yesterday, her aunt described how "traumatic" this situation has been for Nóra's parents.
The founding Chief Executive of the UK's Child Exploitation and Online Protection Centre said the Quoirins are "living every family's nightmare".
Speaking on RTÉ's Morning Ireland, Jim Gamble said cases where children go missing abroad are very rare.
"Given that she hasn't been found doesn't mean there isn't hope. There is a strong chance she could be lost, unconscious, trapped in undergrowth somewhere. That is the the type of fuel needed to keep pressing on in the search," he said.
Mr Gamble said he was confident that police in Malaysia were doing everything they could to find her..
He said they would be looking at a structured search for a missing person, but also there may be a criminal element, which police will be investigating.
Mr Gamble said another possibility was "the opportunistic abduction", where someone has been in the wrong place at the wrong time and someone else has taken advantage.