Four people are being held in connection with an armed robbery on a post office in Co Louth earlier this year.
The robbery took place in Clogherhead on 3 May.
Three men - aged 30, 33 and 42 - and a 23-year-old woman were arrested in the Louth area.
They are being held at Balbriggan, Dundalk, Drogheda and Navan garda stations.
