Man arrested and firearm recovered on Dublin to Belfast train
The incident took place around 3.20pm on Wednesday and the suspect being questioned at Store Street garda station.
The 20-year-old has been detained under Section 30 of the Offences Against the State Act.
It is not yet known if the incident is terrorist related.
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Hide AdThe train was delayed for 15 minutes while police carried out the operation.
A Translink spokeswoman said: “A person on the 1520 Enterprise train was arrested by gardai before the train departed Connolly Station in Dublin.”