The N2 is set to remain closed tonight following a fatal collision today in Co Monaghan.
A man aged in his 50 was arrested in relation to the crash and remains detained in Garda custody under section 4 of the Criminal Justice Act, 1984.
Gardai say the N2 remains closed as forensic investigations continue at the scene and diversions remain in place.
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The fatal collision involved a HGV and a car and occurred on the N2 at Mullaghnee, Annalitten, near Broomfield.
The driver of the car, a female in her 30s, was pronounced dead at the scene.
Gardaí are appealing to anyone who may have witnessed this collision to contact them.