A woman has died and four people have been hospitalised following a road collision.
The two-car collision occurred on the M4 near Kinnegad in Westmeath at about 1.30am.
Jacqueline Wolohan, 51, of Coolock in Dublin was killed in the incident.
A female passenger and two children have been hospitalised with injuries. The driver of the other car, an off-duty garda, is also receiving medical attention.
The eastbound carriageway of the M4 between the Kinnegad and Enfield exits was closed this afternoon, for the forensic examination.
The Garda Síochána Ombudsman Commission has opened an investigation and is appealing for anyone who witnessed the collision.
In particular, GSOC is appealing to anyone who may have seen a blue Opel Astra, 2005 registration, or a silver Nissan Micra, 2004 registration, travelling on the eastbound side of the M4 at about 1.30am this morning, or anyone with information which may assist the investigation to contact them on 1890 600 800.