The 74 year old has been missing since yesterday.

'Gardai believe Gavin may have travelled to Dublin City'

Anyone with information is asked to come forward.

Gardaí say anyone who makes contact will be treated with confidentiality, compassion and sensitivity.

'We need people standing on the shorelines keeping watch over the water, we need people walking the shorelines, we need people in boats out on the Lough'

Kelsey Kenny and Seamus Hynes are both missing from the Cloghernagh area of Co. Monaghan since Friday afternoon.