Three men who were being questioned about an alleged rape in Dublin's Blanchardstown were released from Garda custody this afternoon.
Gardaí said a woman in her late 20s had been the victim of a serious sexual assault in the Castlefield Park area at around 3am on Sunday morning.
A 20-year-old man and two 16-year-olds - all non-nationals - were arrested in connection with the incident.
Gardaí said they had been released pending further inquiries.