Police looking for missing Auckland woman Kim Bambus haven't ruled out anything, including foul play.
"There are an endless number of possibilities because at this stage we don't know what's happened to Kim," Detective Inspector Hayden Mander told media on Sunday afternoon.
The 21-year-old was last seen in Ponsonby on Friday morning when she told friends she was going to Piha for a run.
Her yellow Hyundai car was found on Log Race Rd at around 1am on Saturday morning, near the entrance to the Mercer Bay loop track.
Police and LandSAR scoured the area yesterday but had to call off the search in the failing light.
Forty police, search and rescue and LandSAR volunteers are taking part in the search on Sunday, which will continue into the evening.
The police Eagle helicopter is set to join the search, while surf livesaving groups are scouring the shoreline.
Insp Mander said if Ms Bambus isn't found on Sunday night, the search will resume on Monday.
"We are still keeping open mind as to what has happened to Kim, and we very much remain hopeful that she remains alive and will be found alive."
Anyone with information is encouraged to contact police on 0800 528 337, including residents who may have CCTV footage, or those who walked tracks in the area recently.
Ms Bambus was last seen wearing a pink exercise top and shorts, while potentially carrying a black jacket.
With poor weather due to hit on Sunday night, police are growing increasingly concerned for her safety.
They are also investigating whether she had any history of mental illness.
Newshub.