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Alanna Greene was last seen walking on Mountain Road, near Killam Drive, on Sept. 16. (RCMP)

The search for a missing Moncton woman continues after a search of Centennial Park on Thursday turned up no clues.

Alanna Greene, 29, was last seen walking on Mountain Road, near Killam Drive, on Sept. 16 at about 5 p.m.

Robyn Greene says her daughter's disappearance is completely out of character and that she doesn't have her wallet or any identification with her.

"At this point we just don't know  — and that's the hard part," she said.

"It's like, you know, looking for a needle in a haystack. We don't know where to look, we just don't know."

Codiac Regional RCMP have received tips regarding sightings of Alanna from as far away as Saint John.

On Thursday, police and members of the Tri-County Ground Search and Rescue combed through Centennial Park in Moncton's west end, following up on tips that she had been spotted there.

'This is very unlike her. You know, she would never go anywhere without letting someone know where she was.'—Robyn Greene, mother

Police don't believe anyone else is involved, said Const. Damien Thériault.

"At this time, the investigation into Alanna Greene's disappearance is continuing and we are still requesting the public's assistance," he said.

A Facebook group called "Bring Alanna Home" had more than 6,700 members as of Friday afternoon.

Her mother is asking the public to report any possible sightings to police.

"This is very unlike her. You know, she would never go anywhere without letting someone know where she was," said Greene.

"If she felt that she needed to get away, that's fine, but again, it's not like her."

Greene found out her daughter was missing on Sept. 17, when Alanna's live-in boyfriend called, wondering if anyone had seen her.

Alanna had been out running an errand on Sept. 16, she said.

Although Alanna has a job in Moncton, she is currently on leave, Greene said.

Alanna is about five-feet, four-inches tall and weighs about 135 pounds.

She has brown, shoulder-length hair and brown eyes.

When she disappeared, Greene was wearing a blue sweater, blue jeans and white shoes. She was carrying a blue backpack.