Have you seen Sebastian? Family of missing teenager concerned for his welfare

Gardaí are seeking the public's assistance in tracing the whereabouts of a missing 18-year-old boy.
Sebastian Palma Sigmond - described as being approximately 5’ 9’’ tall, with short black hair and brown eyes - was last seen by his family at approximately 5pm on Friday evening (July 7) when he left to go walking in the Dooagh area of Achill, Co Mayo.
When last seen he was wearing a navy blue jacket and trousers, brown boots and a peaked cap.
Sebastian’s family are concerned for his welfare and have asked An Garda Síochána for assistance in locating him.
Anyone who has seen Sebastian or who can assist in locating him is asked to contact Westport Garda Station on 098 25555, the Garda Confidential Line 1800 666 111 or any Garda Station.