Police are appealing for public assistance to help locate missing 45-year-old Warburton man Daniel Leahy.
Daniel, who also goes by the names Upakaro and Anuttaro, was last seen at Melbourne Airport about 9pm last night.
Police and family members have concerns for his welfare as he has medical conditions.
He is described as 175cm tall with a thin build and shaved head.
He was last seen wearing a track suit pants, a hooded top and black coat.
The below image of Daniel has been released in the hope someone recognises him and can provide information regarding his current whereabouts.
Daniel is known the frequent the Organ Pipes National Park in Keilor Park.
Anyone who sights Daniel or has information on his whereabouts is asked to contact Broadmeadows Police Station on 9302 8222.