Gardaí say investigations into a serious sexual assault in Dublin this week are continuing.

Two men arrested in connection with the investigation were released without charge last night.

A woman in her 30s reported being attacked and sexually assaulted at about 3.20am on Thursday morning by a number of people.

Gardaí have appealed to witnesses – in particular drivers and taxi-drivers who may have been in the area at the time – to contact Ronanstown garda station.