Four people who were being questioned as part of an investigation into the disappearance and suspected murder of a couple who have been missing for over five years have been released without charge.

William Maughan and Anastasija Varslavane, who was originally from Latvia, were reported missing from Laytown, Co Meath in April, 2015.

Three men and a woman were detained on Wednesday in relation to the investigation.

They were released from garda custody last night and a file is being prepared for the Director of Public Prosecutions.

The case was upgraded to a murder investigation in September 2016.

Gardaí are continuing to appeal to anyone with information relating to the investigation to contact Ashbourne Garda Station on 01-801-0600 or the Garda Confidential Line on 1800-666-111.