Schools to remain open as sub-zero warning extended until Friday

A heavy frost surrounds Bunratty Castle and grounds in Co Clare (Niall Carson/PA)

People have been warned to take care on the roads over the coming days as sub-zero temperatures cause hazardous conditions for drivers and pedestrians.

It comes as a status yellow low temperature warning has been issued for Ireland until noon on Friday, with temperatures forecast to drop below minus 5C in parts of the country.