College students are receiving counselling after one pupil was stabbed to death and another left fighting for his life.
The grief-stricken parents of German student Thomas Heinrich have arrived in Ireland to make arrangements to take his body home.
The 22-year-old, from Munich, was killed on Saturday morning after a knife attack on St Anthony's Road, outside Herberton Apartments in Rialto. His friend Robert Rinker, who is also from Germany, remains in a critical but stable condition in hospital.
The pair were both studying at Griffith College in Dublin, where staff and students are said to be deeply shocked and saddened.
A statement from Griffith College president Diarmuid Hegarty said : "Griffith has been providing counselling services to students and faculty staff since Saturday evening, and will continue to provide this service."
The friends, who were on a media management course, were part of a group of 44 German students and were living off-campus in rented accommodation.
It is understood Mr Heinrich was on the balcony of his first-floor apartment with his German flatmate when words were exchanged with two teenagers walking on the street below. A row later broke out and both men were stabbed. They were rushed to St James's hospital, where Mr Heinrich later died.
Over the weekend, two teenagers were detained in relation to the knife attack while a woman in her 40s was questioned on suspicion of withholding information.
The three were freed on Sunday night and a file will be prepared for the Director of Public Prosecutions.
Meanwhile, another teenager was arrested in connection with the stabbing and was later released.