Updated 9:15am
A teenager has been hospitalised after a stabbing on a train in Dublin last night.
The incident happened on a northbound service, between Killester and Harmonstown.
Gardaí were called to Killester DART Station at around 10pm.
A young man, aged in his late teens, had received a stab wound to the chest.
He has been taken to Beaumont Hospital, and his injuries are not believed to be life-threatening.
Another man - also aged in his late teens - was arrested at the scene.
He is being held at Raheny Garda Station under Section 4 of the Criminal Justice Act, 1984.
Gardaí say it appears the victim and the suspect were known to each other.
Rail services were suspended for a time between Clontarf and Howth Junction following the incident, but are now back up and running.
Labour party Senator Aodhán Ó Ríordáin argued that the incident shows the need for a dedicated transport police.
He observed: “This is the latest in a long list of troubling incidents on the Northside line.
“I welcome the fact that Minister Ross has indicated his willingness to explore the possibility of establishing a Transport Police Service. The proposal must be brought to fruition as soon as possible for the safety of commuters and staff on our public transport system.”