"Nora's family believe she has been abducted", they said in a statement carried by PA. "Her parents and our families in Ireland and France are distraught by her disappearance".
"She looks younger, she is not capable of taking care of herself, and she won't understand what is going on", they said.
On Tuesday, police expanded their search for the missing teenager and it is understood that sniffer dogs, helicopters, fire and rescue services, civil defence and forestry departments have all been deployed.
Police have extended search operations for missing teenager Nora Quoirin to Sungai Berembum, near The Dusun resort, following an eyewitness report.
Che Zakaria Bin Othman, the deputy police chief for Negeri Sembilan, the state the girl's family was visiting, said: "So far, there's no indication of foul play; however, the investigation is still ongoing".
A Malaysian General Operations Force (PGA) police officer points into the bush during a search and rescue operation for Nora Quoirin.
He said the operation covered a 4ha area around the resort where the family was staying and was assisted by an aerial search.
The search for a teen with special needs from London who vanished over the weekend while on a family vacation to Malaysia has intensified as her family and law enforcement continue to disagree over whether foul play was involved.
Mohamad said the girl's mother had reported that she was only in her undergarments when they put her to bed but it was unclear if she was dressed when she disappeared because nobody saw her leave. The family of Quoirin says her father discovered her missing from her bedroom Sunday, Aug. 4, 2019, at a resort hotel in a nature reserve, south of Kuala Lumpur.
St Bede's Church in Clapham Park, where Nora and her family were parishioners, called on people to "pray for her safety and for her family who are distressed at this time".
Missing persons charity the Lucie Blackman Trust (LBT) had previously said Nora's disappearance was being treated as an abduction.
Quoirin's family, however, insisted that she would not have left her bedroom herself. "We are appealing to everyone to assist the local police in any way they can and to pass on any information that would help locate our beloved Nora without delay".
The local indigenous people - known as Orang Asli - are also helping with the search for Nora.
Her window had been opened.
The page has raised more than £11,500 and has been set up "to cover any unforeseen expenses or charges" as more family members travel to Malaysia.
A spokesman for Ireland's Department of Foreign Affairs said they were "aware of the case and providing consular assistance".
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