A young woman was left horrified when a young man sat beside her on an early morning bus into the city centre and allegedly masturbated.
The woman boarded the Number 40 bus on Tuesday morning at around 9am.
The young man, who was reportedly in his late teens or early 20s, was already on the bus but moved from his seat to sit beside the woman.
The man then appeared to begin masturbating after he sat beside her.
The woman shared details of the shocking encounter on a local Facebook group.
She said: "I'm pretty upset about what happened."
The woman managed to take a brief video of the encounter, which has been seen by Dublin Live.
She also reported the incident to gardai and gave them the footage of the incident.
Dublin Live has contacted An Garda Siochana for comment.