The incident occurred on April 1.
Three youths have been arrested following an assault on a group of teenagers at Howth Junction DART station last month.
CCTV footage recently emerged of a girl falling between the DART and the platform during the attack, in which other teenagers appear to have been kicked and spat at.
In the video, she can be seen walking along the platform when a youth lunges at her, while another thrusts the wheel of their bike causing her to fall between the platform and the train.
The 17-year-old was pulled free from the tracks by a security guard and a passer-bys before the train began moving.
Gardaí conducted searches in North Dublin this morning, May 13, and have since arrested three teenagers, two aged 16 and one aged 13, on suspicion of violent disorder under the Public Order Act, 1994.
They are currently being detained under Section 4 of the Criminal Justice Act, 1984 at Clontarf, Raheny and Coolock Garda stations.
"During the course of the searches a number of items of clothing were seized, as well as pedal cycles and mobile phones," Gardaí said.
The investigation is ongoing.
