A boy has been arrested after a boy was fatally stabbed at a Tusla care facility in north Dublin.
The stabbing occurred during a row at an emergency residential unit in Donaghmede, housing four unaccompanied children seeking International Protection.
A murder investigation is under way.
The unit, at Grattan Wood apartment complex, is run by a private company on behalf of Tusla, the child and family agency.
Emergency services were called shortly after 11am after a row broke out between two of the teenagers, who are understood to be 17 years of age.
One of them was stabbed and fatally injured.
Gardaí arrested a teenager at the scene. He was taken to hospital with serious injuries.
A female staff member, who tried to intervene and stop the fight, was treated for minor injuries and also taken to hospital.
The area has been declared a crime scene and two apartment blocks cordoned off.
State Pathologist Dr Yvonne McCarthy arrived at the scene earlier and has been conducting a preliminary examination.
The boy's body has been removed to Dublin City Mortuary, where a post-mortem examination is due to be conducted tomorrow.
Specialists from the Garda Technical Bureau and Forensic Science Ireland are also carrying out examinations.
Gardaí have appealed to witnesses or anyone with information to contact them at Coolock Garda Station.
An incident room has been established and a senior investigating officer appointed.
Gardaí will seek to contact family members and relatives of the deceased who may be abroad.
They said that there is no ongoing threat, the incident is self contained, they are not looking for anyone else and are following a definite line of inquiry.
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Tusla statement
In a statement, Tusla said the unit "provides care on a 24-hour basis to four separated young people seeking International Protection".
The child and family agency said: "The incident involved two young people, during which a fatal injury was sustained. An Garda Sióchána are now conducting a full investigation and we are co-operating fully with their enquiries.
"Our immediate priority is the safety and wellbeing of the other young people and staff at this unit.
"We are providing additional supports to everyone directly affected and making efforts to contact the families of the young people who were residing there.
"In order to protect the privacy of the young people involved, and given the ongoing Garda investigation, we are not in a position to provide further detail at this time."
Martin 'shocked and saddened'
The Taoiseach has said he is "shocked and saddened" at the loss of life in Donaghmede.
In a statement, Micheál Martin said: "Our thoughts go to the bereaved family and those injured during this incident.
"The wellbeing of the young people in this facility and the staff is now paramount.
"It is important they are offered every possible support at this difficult time as An Garda Síochána conduct a thorough investigation."
Minister for Children, Disability and Equality Norma Foley, meanwhile, said she is "truly saddened to learn of the passing of a young person during an incident at a care facility in north Dublin today".
"I extend my sincere sympathies to the young person's family.
"My absolute priority is the safety and wellbeing of everyone involved in the incident and those who care for them."
