Irish-Israeli woman Kim Damti, who had been missing in Israel since Saturday’s attacks by Hamas, has been confirmed dead.
Ireland’s foreign minister said it was devastating that the hope she might be found alive “has now been extinguished”.
Kim Damti, 22, was at the Supernova music festival in Re’im in southern Israel when she was last seen.
The killings at the festival were part of a wave of attacks launched by Hamas on Saturday.
More than 260 bodies have been recovered from the site.
Sending condolences to her friends and family, Irish President Michael D Higgins said the “circumstances in which her life was taken” at the music festival were “truly appalling”.
“It is not only those of us who are parents, but all of those who feel that young people should be free to attend events with their peers in conditions of safety, who will find such circumstances where a young life is taken so appalling,” he said.
He said her death was a reminder of the “outrageous breach of fundamental international law in conditions of conflict it is to target civilians in this way.”
Writing on social media, her sister, Laura Damti said the family had lost “our angel, our flower”.
She said her sister had been “murdered by cursed terrorists”.
Micheál Martin, who is tánaiste (deputy prime minister) as well as foreign minister, said he had spoken to Ms Damti’s family and sent them heartfelt condolences on behalf of the Irish government and people.
“We are with them in their grief,” he said.
“For anyone to lose a child is devastating. To lose a child in such circumstances is indescribable.”
In a statement to Irish broadcaster RTÉ, her aunt Pat Cooper thanked everyone who had supported the family “with love and encouragement” since Saturday.
Taoiseach (Irish Prime Minister) Leo Varadkar said Ireland was united in mourning for Ms Damti.
“Her death, and the deaths of more than a thousand other citizens of Israel and from around the world, was senseless and barbaric,” he said.
Ms Damti’s sister said the funeral would take place on Thursday at 17:00 local time at the cemetery in Gedera.
The death toll in Israel from the Hamas attacks has reached 1,200 – while more than 1,100 people have been killed by Israeli air strikes on Gaza
Sinn Féin leader Mary Lou McDonald sent the Damti family condolences as they “endure the heartbreak of the loss of her young precious life”.
“A trauma that should not be inflicted on any family,” she added.
Earlier in the week, Ms Damti’s mother said she last spoke to her daughter at 06:30 local time on Saturday, just as Hamas gunmen launched their attack.
Her daughter ask: “Mammy, what should I do?”.
Ms Damti’s brother instructed his sister to take shelter.
It was the last time the family heard from ther.
“Kim didn’t realise that there was seven or eight Toyota vans full of terrorists,” Jennifer Damti, told ABC News, external on Sunday.
“They just shot everywhere, slaughtered them like dogs,” she said.
The Israeli military says it has thousands of troops ready near the border of Gaza for a potential ground invasion, following days of air-strikes on the territory.
The United States is in talks with Israel, the UN and Egypt on allowing some aid in to Gaza and some residents out, the White House says.
On Wednesday an emergency government was formed in Israel, with opposition leader Benny Gantz joining the existing government to manage the war.
A new war cabinet has been formed – it will include Gantz, Israeli Prime Minister Benjamin Netanyahu and the defence minister Yoav Gallant.
It brings to the war cabinet two voices who are experts in military strategy.
Both Gantz and also Gadi Eisenkot, who joins as an observer, are former Israeli Defense Forces chiefs of staff.