Gardaí have opened a double murder investigation following the death of a second man after an attack in Drimnagh at the weekend.
Pawel Kalite (26) originally from Poland and with an address on Benbulbin Road, Dublin 12, died in St James's Hospital after being stabbed in the throat with a screwdriver.
His friend Marius Szwajkos (27), from Szczucin in Poland, died on Monday after he was stabbed in the head during the attack.
Gardaí had opened a murder case following the death of Mr Szwajkos and are questioning a third teenager today. The 17-year-old was arrested at 4pm yesterday after going to Sundrive Road Garda station.
Two other teenagers, aged 19 and 15, have already been questioned by gardaí and released without charge.
Gardaí believe the three were on Benbulben Road, Drimnagh, just before 7pm on Saturday. Files are being prepared for the Director of Public Prosecutions.
Both the victims came to Ireland last year looking for work in the construction industry. It is believed they were attacked after they refused to buy alcohol for a group of local teenagers.
The sister of Mr Szwajkos said this afternoon she "did not blame the people of Ireland" for what happened to her brother.
Gosia Szwajkos, who had lived in the west of Ireland but returned to Poland last year, said she wanted to thank the gardaí and hospital staff for their actions following the attack.
"My family do not wish to blame the people of Ireland and would prefer to think that this attack could have happened anywhere in the world," Mr Szwajkos told Newstalk's Lunchtime Show.
"Marius was a very good, quiet man and part of my heart and my mother and fathers' hearts have died," she said. "The people who did this are not human."
Both victims' families have now arrived in Ireland from Poland. Accommodation has been provided by Dublin City Council, and a fund for the families has been set up at the AIB on the Naas road.