Gardai investigating a suspicious fire at a house in Drogheda Co. Louth yesterday have arrested a fourth person.
Meanwhile, three men arrested yesterday evening in relation to this incident were released this evening without charge.
The woman in her 70's suffered severe burns and is in a serious condition after a fire broke out at her house on Chord Road in the town yesterday morning.
A neighbour has been praised for his heroic actions - after he went into the burning building to rescue the woman.
A 26-year-old woman was arrested this evening in Drogheda and is being detained at Drogheda Garda station.
