Gardaí have released without charge a man being questioned over the disappearance of a Dundalk teenager 18 years ago.

Ciara Breen was 17 when she went missing from Bachelors Walk in Dundalk, in the early hours of February 13th 1997.

A man aged in his 50s was arrested yesterday morning, after new information came to light about the case.

He has been released from Drogheda garda station this morning, and a file is being prepared for the Office of the Director of Public Prosecutions (DPP).

Gardaí are again appealing to anyone who might have information about Ciara's disappearance to come forward.

They are asked to contact Dundalk garda station on 042-9388-400, the Garda Confidential Line at 1-800-666-111 or any garda station.