An official Garda firearm was discharged during the course of the operation.
A Garda required medical treatment after they were attacked by a dog while carrying out an arrest in Dublin.
A man in his 20s has been arrested as part of ongoing investigations into armed robbery incidents in Rialto and Kilmainham in Dublin.
Shortly after 12pm on Monday, a man armed with a hand gun entered a shop in Rialto and threatened staff before leaving the scene with a sum of cash.
Shortly after, a man entered a supermarket and post office in the Kilmainham area and threatened staff before leaving the scene with a quantity of cigarettes.
No one was physically harmed in either incident.
In the course of a follow-up operation, local Detectives and members of the Armed Support Unit (ASU) searched a house in the Inchicore area on Monday evening and arrested a man in his 20s.
He is currently detained under Section 30 of the Offences against the State Act, 1939 at Kevin Street Garda Station.
A number of items believed to be connected with the robberies were seized in evidence.
During the operation, an official firearm was discharged when Gardaí were attacked by a dog.
One Garda member was injured in the attack and required medical treatment while the dog has been removed for veterinary treatment.
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