Espanola OPP is still looking for 25-year-old Braiden Eshkakogen who left the Espanola Regional Hospital around 10:00 am yesterday morning in nothing but a hospital gown.
OPP Constable Shona Camirand says the local schools were put on lockdown and road checks were put in place as the search got underway.
Eshkakogen was described as a young man who has a past of unpredictable behaviour.
The OPP canine unit, regular officers, and the OPP helicopter carried out a search throughout the day but failed to find him.
He is described as five-foot, nine inches tall, 170 pounds, shaved head, brown eyes, tattoos on arms.
The public is asked to call police with any information or sightings.