A chemical leak at a swimming pool has seen up to 50 children taken ill.
Five people were taken to hospital for further treatment, of which three were children.
A large number of people have had a reaction to the water, according to local reports.
A number of ambulances and other emergency services are on the scene at the Aura Leisure Centre in Letterkenny, Donegal.
RTE reports that the children became unwell during a swimming lesson this morning.
Letterkenny hospital has put its emergency plan in place.
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Emergency services say there are no life-threatening injuries but the incident has been described as 'very serious'.
The leisure centre has been evacuated with the Donegal Daily reporting that "a large number of children were in the swimming pool at the time".
Doctors and nurses are also on site at the centre where they have been treating the children for injuries which are not believed to be serious.
