Gardai in Dublin are seeking the public’s help in tracing the wherabouts of a missing teenager.

16 year old Mark O’Brien has been missing since August 14th and was last seen on Cherry Orchard Avenue in Ballyfermot.

He is 5 foot 4 inches in height, around 7 stone with black hair.

When last seen, Mark was wearing grey tracksuit bottoms, grey shoes with red on the soles and a grey t-shirt.

Anyone with information is asked to contact Clondalkin Garda Station or the Garda Confidential Line.