About a dozen people wearing balaclavas stormed a Dart train in north Dublin on Tuesday night, threatening passengers and causing about €4,000 damage.
In what Irish Rail has described as an “unprecedented graffiti attack”, the group blocked the doors of the train with pieces of wood at Clongriffin Station at about 10.30pm, preventing the train from moving.
Train passengers said they were threatened by the gang with pieces of wood and that the attackers began fighting among themselves.
Irish Rail said: “This was aggressive and threatening criminal activity.”
After spray-painting parts of the train, the group fled at Clongriffin, running up the tracks as gardaí were alerted. No arrests were made but gardaí and Irish Rail are reviewing the CCTV footage.