On Thursday, Mr Yusop said they are investigating "all angles" in Nora's disappearance, two days after her family said they believed she had been abducted.
Negri Sembilan deputy police chief SAC Che Zakaria Othman said police have received the lab results of the fingerprint samples, but investigations are still ongoing to ascertain the identity of the individual they belongs to.
Malaysian police have "not ruled out anything" but are treating the 15-year-old's disappearance as a missing persons case.
"We still have hope and believe that she is still in the area".
She vanished from Dusun eco-resort in southern Negeri Sembilan state on Sunday.
This was conveyed in a statement issued by the Lucie Blackman Trust, a British charity supporting its nationals during a crisis overseas, as the SAR entered its fifth day today.
The grandfather said he understands that the French ambassador has met with high-level Malaysian officials over the case.
The family believe Nora, who has learning and developmental disabilities, was abducted.
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.
He said in the voice recording, Meabh sounds persuasive like how she usually talks to calm down Nora Anne.
In a video statement on Wednesday, Nora's family said the situation had been "extremely traumatic" and they were "unable to deal with this at this moment".
"We have no reason to believe she wandered off and is lost".
Probe the abduction theory, urged the desperate family of a British teenager who went missing in Malaysia.
SAR operations involving more than 170 people from the Fire and Rescue Department, Civil Defence, Rela, and the Forestry Department are still ongoing.
Investigators said they have not obtained any other information or leads that suggest other possibilities.
"But we must remain hopeful".
Some of her relatives were seen trekking on a hill in the search yesterday.
"Nora's family wish to express their deepest gratitude for the Royal Malaysian Police force, the search and rescue teams, and emergency services, for all they have done for us in this hard time", it said.
Sniffer dogs are also being used in the search as well as local indigenous people - known as Orang Asli.
They arrived in Malaysia on the "holiday of a lifetime" on Saturday, but by Sunday, their vacation dream had turned into a nightmare..
Investigators have questioned 20 people so far and said a forensic team is analyzing fingerprints found in the cottage where the girl went missing. "We will also try to call out Nora's name during the operation", he added. "Bukit Aman forensics was roped in to assist us", he said at a press conference this evening held at the Pantai police station, here.
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