A teenager who broke a Luas passenger's nose when he was confronted for smoking on a tram has been jailed for three months.
Jordan Lee (19) punched the victim in the face as he lashed out at another passenger who asked him to stop smoking on the Red Line.
Judge David McHugh sentenced him for the "disgusting" unprovoked attack.
Lee, of Slievenamon Road, Drimnagh, admitted assault causing harm to a man at Suir Road on February 17 last year.
Blanchardstown District Court heard that Lee got on to the tram and started smoking a cigarette.
One of the passengers told him to stop, and as a result Lee lashed out at the passenger and hit the victim.
Gardai were called and the man was taken to hospital suffering from a nose injury and cuts and bruises to his face.
Gardai viewed CCTV footage and the defendant was arrested at a later date.
The court heard that the victim had suffered a broken nose, and while he had made a good recovery he still complained of issues with his breathing and had pain on the bridge of his nose in cold weather.
Lee had a previous conviction for assault and was under a suspended sentence.
He made full admissions when interviewed and identified himself to gardai on the CCTV footage, his solicitor told the court.
He apologised for his behaviour, which he himself described as "disgusting".
A garda said the accused had not handed himself in and it was by a "stroke of luck" that he was noticed walking near Parkgate Street.
Lee had had a traumatic upbringing, the court heard.
He was originally from Ballymun, his parents led a chaotic lifestyle and he had lived in a succession of "transient" accommodation before staying with his step-grandfather in Drimnagh.
In an assessment, the defendant was found to have a mild learning disability due to having missed education while absconding.
He had "low-level" intellectual function, his solicitor said.
Lee had taken steps to address his anger management and substance abuse issues.
"This is his second outing with what would appear to be very violent assaults on people," said Judge McHugh, who added that he accepted Lee had had a "terrible background".