A PSNI spokesperson said: “Patrick may have used public transport to travel to Derry.
“The last sighting of Patrick was at the Translink Foyle Street Depot on Friday afternoon ( Friday 3rd August).
“At this time it is believed Patrick was wearing a dark coloured, long sleeve top with white sleeves and had a large black backpack with him.
“We would ask if you have any information on Patrick’s whereabouts or believe you may have seen Patrick, please ring police in Limavady on 101 quoting ref CCS 1601 03/08/18.”
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