The Garda Síochána Ombudsman Commission is investigating a fatal car crash in Dublin after the incident was referred to it by gardaí.

Sineád Maguire, 43, from Bayview Avenue in Dublin died when the car she was travelling in hit a pole at Fairview at the junction of Malahide Road at 1.50am.

The 26-year-old driver was taken to Beaumont Hospital where his condition is described as critical.

A 20-year-old man who was also in the car is in a stable condition in St James's Hospital.

Gardaí had been following the vehicle before the crash.

Gardaí have appealed for witnesses to contact Clontarf Garda Station at 01-6664800, the Garda Confidential Line on 1800-666-111 or any garda station.

Several roads were closed earlier due to the collision. The Fairview Malahide road junction later re-opened.

In a separate incident, a 21-year-old man was killed in a single-vehicle crash on the N81 Blessington Road.

It happened on the Tallaght side of Brittas village at 2.40am.

Four other men in the car, aged between 19 and 22, were taken to Tallaght and St Vincent's hospitals with non-life threatening injuries.