Four people have died and a woman and two children are seriously ill in hospital after a lorry smashed through the central reservation on the M5.

The M7 Limerick/Dublin Road has reopened southbound but remains closed northbound as a truck which was on fire is removed south of the J15 road to Ballybrittas.

Dense freezing fog was causing difficulties for motorists this morning, especially in the midlands where a major crash caused a closure of the Dublin-Limerick road, according to AA Roadwatch.