Gardaí have said three men and one woman have been arrested.
Four people have been arrested in connection with an armed cash-in-transit robbery that took place in Dublin 12 earlier this year.
The incident occurred on the afternoon of Thursday, 3 June outside a post office on the Old County Road in Crumlin.
Gardaí previously reported that at around 12.15pm, a male armed with what appeared to be a firearm approached an employee transporting a cash box and threatened him.
The male gunman fled the scene with the cash box and got into a Ford Focus car, which subsequently drove at speed in the direction of Clonard Road.
No injuries were reported during the course of the incident.
On Thursday, Gardaí announced they had arrested three men, two aged in their 20s and one in his 50s, and one woman aged in her 20s in connection with the robbery.
The four are currently being detained under Section 30 of the Offences Against the State Act, 1939, at various Garda Stations in Dublin.
Investigations into the incident are ongoing, a Garda spokesperson said.
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