Gardai launched a major search operation after a kayak overturned on the River Barrow.
The incident happened earlier on Sunday in Co Kildare.
Gardai said that a multi-agency search operation was launched, and an Irish Coast Guard helicopter was also dispatched to the area.
Officers confirmed that a youngster was rescued from the water after getting into difficulty.
One person is still believed to be missing after the incident, but gardai said that the search is currently finished for the night.
A garda spokesman said: "A multiagency search operation took place today, Sunday 28th February 2021 following reports of a kayak overturning in the River Barrow.
"A juvenile was rescued from the water and was treated at the scene by paramedics.
"A further person is believed to be still missing.
"The operation has ceased for tonight."
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