An Irish woman was among at least 39 people killed in an attack on a Tunisian holiday resort during a day of terror which spread across three continents.
Mother-of-two Lorna Carty died when a gunman pulled out a Kalashnikov hidden in a beach parasol and opened fire on sunbathers at the beach resort of Sousse.
The worst such attack in Tunisia's history came on the same day a man was found decapitated after an attack by suspected Islamic extremists on a French factory.
And a Shi'ite mosque in Kuwait was also bombed, killing at least 25 people.
Although the attacks do not appear to be directly linked, they come after the Isil extremist group called for their followers "to make Ramadan a month of calamities for the non-believers".
Mrs Carty, a 53-year-old nurse from Robinstown, Co Meath, was holidaying with her husband Declan when she was shot.
Bodies covered with blankets were strewn across the beach and medical staff used sun loungers as stretchers to carry away the dead and injured.
Friends said Mr Carty, who is recovering from heart surgery, was "absolutely devastated".
The holiday was believed to be a present for the couple, who have two children, to help with his recovery.
The close-knit communities of Robinstown and nearby Dunderry - where the couple's son Simon plays GAA - were reeling as news of the tragedy spread.
Friend Marie Dowd described Mrs Carty as one of the nicest people she had ever met.
"I just can't believe it," she said. "The whole community is in shock.
"When a tragedy like this happens, you always say nice things about the person but in Lorna's case, a few nice words are not enough.
"She was at the centre of everything in this community. She and Declan were heavily involved in the local GAA team. Lorna was always fundraising and helping out.
"She was an absolutely beautiful woman in every sense of the word. She was even beautiful at her job, she was a beautiful nurse who was so kind to her patients.
"My heart goes out to her family."
Foreign Affairs Minister Charles Flanagan last night said he could not rule out the possibility of more Irish victims being caught up in the attack and described it as a "black day".
"There are a number of Irish families in the immediate vicinity of the hotel and in nearby hotels and in the resort in Tunisia," he said.
"We have upgraded our travel advice, which is that anybody that is travelling to the region, we are asking that they exercise caution in doing so.
"We are urging people who may know of other Irish citizens in the area to contact the tour operators, or more particularly, our emergency helpline.
"The situation is very volatile. We are urging people to exercise caution in travelling."
Officials were last night trying to get the final numbers on the amount of Irish people in the region.
About 180 holidaymakers fly to the capital of Tunis each week, with Sousse the second most popular resort for Irish holidaymakers.
And more than 100 Irish tourists decided yesterday to fly out on package holidays to Tunisia just hours after learning of the bloody massacre.
Some Irish people who were due to stay at the hotel where the mass killings took place declined an offer to be moved to another hotel and instead indicated they would check into the hotel - the Imperial Marhaba - when they arrive in Sousse.
But other Irish people refused to board the flight in Dublin last night after hearing the terrible news.
Witnesses said the gunman used a Kalashnikov to shoot the tourists sunbathing on the beach at the Riu Bellevue Park.
His killing spree only ended when he was shot dead by police. A bomb was found on his body.
Sunway Holidays, one of the main operators providing holidays to Tunisia, said it was working closely with the Department of Foreign Affairs to ascertain how the situation was developing for its customers.
Some of the 180 passengers scheduled to depart from Dublin Airport on a 3.30pm flight yesterday decided to abort their holiday as the scale of the massacre became to emerge.
Martin Skelly, President of the ITAA, said travel agents and tour operators were working closely with officials to assist anyone currently in Tunisia, or with outstanding bookings.
It was a bloody day: a wave of attacks across three continents within a matter of hours, leaving more than 60 dead and stoking fresh fears about the threat posed by jihadists claiming affiliation with or inspired by Islamic State, the militant group also known as Isil.
The fact that there are still tourists to attack in Tunisia tells its own story. Ever since it became the birthplace of the Arab Spring in 2011, the tiny north African nation has been the only country in the region to enjoy anything approaching stability after the overthrow of its resident dictator.