The Minister for Foreign Affairs Charlie Flanagan has condemned Friday's terrorist attacks in France, Tunisia and Kuwait.
The minister has also confirmed the death of an Irish citizen in the Tunisian attack.
Ireland's Ambassador to Spain has flown from the embassy in Madrid to Tunisia. The foreign affairs department has also upgraded the threat level of Tunisia, warning Irish travellers to exercise extreme caution.
Flanagan said Fridays'a attacks bring home to the people of Ireland the horror of such incidents, particularly when they occur in Europe, or on Europe's doorstep.
"I condemn unreservedly the terrorist attacks in Tunisia, Kuwait and France today. Sadly, I can confirm that an Irish citizen has been killed in the attack in Sousse , Tunisia," the minister said Friday.
"Our focus is on establishing whether any other citizens have been killed or injured. I would like to offer my heartfelt condolences to the family and loved ones of the deceased. My Department is providing consular assistance to those affected."
"My Department has opened our Consular Support Line following the incident. Anyone with concerns about family or friends or with information should call the Department on 01 418 0200," Flanagan said.
"Our Ambassador in Spain is en route to Tunisia accompanied by a consular official and will report to me on arrival. The Embassy in Madrid and our Honorary Consul, in conjunction with EU Embassies in Tunis, are monitoring the situation in Sousse, Tunisia, and are providing updates."
"In light of this incident we are changing our travel advice for Tunisia to 'exercise extreme caution'. This decision has been taken following consultation with our Embassy in Madrid and contact with our EU partners. For those Irish citizens who are due to travel to Tunisia over the coming days and who now do not wish to travel, they should discuss their arrangements with the relevant travel companies," the foreign affairs minister continued.
"Irish citizens in Tunisia should remain extremely vigilant and follow the instructions of the police, tour operators, and their hotel staff. As this is a very fluid and fast moving situation our travel advice will be kept under review and we would urge those intending to travel to Tunisia to check the advice before travelling on www.dfa.ie/travel
"I also want to offer my sympathy and my condolences to the Governments and peoples of Tunisia, Kuwait and France but, above all, to those directly affected. Dozens of people have been killed in these brutal attacks. Attacks like these sow fear and prompt revulsion, but they advance no political cause," Flanagan explained.
"Such attacks must be condemned wherever they occur but happening in Europe and on Europe's doorstep brings their full horror home to us here in Ireland. We must continue to work together for the stability of the Middle East and North Africa, and to address the threats to the people of Europe and the region presented by continued instability."
The identity of the woman killed in Friday's attack on a beachside hotel in Tunisia was released Friday night. She was Lorna Carty, a nurse and a mother of two from Robinstown, in Co Meath. She was one of 37 people killed in the attack.