A search is to resume at first light for a young man spotted in the river Nore in Kilkenny city.
A man walking his dog spotted the person in the water at about half past seven last night and tried unsuccessfully to get a life ring to him.
He and another man then saw him go under the water.
A major search and rescue operation was launched involving the Civil Defence, Gardai and Coastguard Helicopter, as well as volunteers who were searching the banks.
Searches were called off overnight, but will begin again this morning.
