A senior officer from outside the Mayo region has been appointed to examine remarks alleged to have been made by two Gardaí about two women who were arrested in Co Mayo last week.
The women were arrested for public order offences during a protest near the controversial Corrib gas pipeline route last Thursday.
It has been alleged that the gardaí were heard joking about threatening to deport and rape one of the women who had refused to give her name to officers.
The alleged remarks were recorded on a video camera which had been taken from the women and which was left running while the gardaí travelled to Belmullet garda station.
Dublin Shell to Sea spokesperson Caoimhe Kerrins said: “This is shocking and extremely serious. It is very frightening for those of us involved in the campaign.
“Gardaí are the people that women are supposed to trust when they need to report a rape. Gardaí are supposed to be responsible for bringing rapists to justice.”