Four men have been arrested in connection with the investigation into recent robberies and assaults on sex workers.
Three addresses were searched yesterday as apart of the investigation.
The four men - aged between 18 and 37 years of age - are being held for questioning under Section 4 of the Criminal Justice Act 1984 at Garda stations in Dublin.
A fifth man was also arrested on foot of a bench warrant, and is now before the District Court.
In a statement, gardaí said: "An Garda Síochána is continuing to appeal to any sex worker who may have been subject to a similar attack to immediately report the incident. Anyone who comes forward will be treated confidentially with compassion and sensitivity.
"An Garda Síochána is also appealing to any person with information on these callous, targeted attacks to please contact Gardaí to assist in bringing these dangerous attackers to justice."
Anybody with information is being asked to contact the Garda Confidential Line on 1800-666-111 or any Garda station.
Gardaí also highlighted a list of victim support groups available on their website.
Last week, gardaí said that since mid-October seven attacks had occurred nationwide on sex workers advertising services on online sites.
They said the motive for the attacks appeared to be for money - although violence was used.
The force described the incidents as "terrifying" for the injured parties, who are both women and men.
On each occasion an online appointment is made, but when the 'client' arrives the sex worker is attacked and robbed by a number of men.