Books of condolence for the relatives and friends of the 10 people who died in Friday's explosion at Creeslough in Co Donegal have opened at several locations throughout the country and online.

An online book of condolence has been opened by Lord Mayor Caroline Conroy for the citizens of Dublin to extend their sympathies to those who have been bereaved in the Donegal village.

It will remain open until Thursday next week.

"This devastating news has had a major impact on everyone throughout the country and we are all shocked and saddened by this most dreadful tragedy," Ms Conroy said.

All messages of sympathy will be printed and forwarded to Donegal County Council.

In Cork, Lord Mayor Deirdre Forde was the first to sign a book of condolence opened at City Hall at 12pm.

She said people throughout the country were heartbroken at the tragic loss of lives in Creeslough and she wanted to express the sympathies of the people of Cork to all those affected.

"People are so sympathetic to this dreadful tragedy," she said.

"I think it will stand to them in time to come to know that we are sending out our thoughts and prayers to them, even as far as the Pope himself which, I feel will be greatly appreciated."

Among those who signed the book of condolences in Cork was Michelle O'Sullivan from Mallow.

Michelle O'Sullivan from Mallow said she comes from a small community and she wanted to support a small community

"I just felt, as an Irish person, I have been to Donegal many times and it's a lovely area and it's really community based," she said.

Thomas Kent from College Road in Cork city took two buses to get into City Hall to sign the book of condolence. He said the tragedy had touched everyone.

"It's a close-knit community. My prayers are with them. I lit a candle for them," he said.

"It's good to think of people like that. If I could blow my prayers in the wind to Donegal and give them a bit of comfort - I will always think of them."

Thomas Kent from Cork took two buses to get to City Hall to sign the book of condolences there

James Scanlan came from Midleton to sign the book of condolence at Cork City Hall.

"I think everybody is affected by this sad occurrence," he said.

"Ten innocent people who went about their business: one going in for a birthday cake for her mother; another man going in for an ATM; somebody else going in for sweets. It could have been any one of us.

"It's the least we can do to show our sympathy. It is very little. Those people are going to go through an awful lot. We just have to pray for them. That's all we can do."

James Scanlan travelled from Midleton to sign the book of condolences at Cork City Hall

An online book of condolence has also been opened in Limerick.

Mayor of Limerick Francis Foley said that "the thoughts of the people of Limerick are with them at this difficult time".

A mass to remember and pray for the victims of the Creeslough tragedy will take place at the Redemptorist church in Limerick city tomorrow evening at 7.15pm.

Fr Seamus Enright, who is Rector of the Redemptorist community at Mount St Alphonsus Church in the city, has encouraged people to come and remember those who died and to pray for them and their families.

He said for a lot of people, faith can help them to survive at a time like this.

A book of condolence can also be signed during office hours at County Buildings in Tralee, Co Kerry.

The Cathaoirleach of Kerry County Council, Cllr John Francis Flynn, said that the entire country has been "deeply shocked and moved by the tragic incident in Donegal".

"On behalf of the members of Kerry County Council and the people of Kerry, I express my sympathies and solidarity with the people of Creeslough at this enormously difficult time.

"Those who lost their lives, their families, and the wider community are in our thoughts and prayers."

A book of condolence has also been opened by Wicklow County Council.

Cllr Tommy Annesley, Cathaoirleach of Wicklow County Council, said: "There are no words for the sadness and grief we are all feeling at this time."

"On behalf of the people of Co Wicklow, I extend our deepest condolences and sympathies to all those affected by this unimaginable tragedy."

Chief Executive of Wicklow County Council Brian Gleeson added that he "would like to pay tribute to the emergency services and crews who attended the scene of the explosion".

"The thoughts and prayers of the entire community of Co Wicklow are with you all at this time," he said.

The book of condolence in Wicklow is available to sign online and will remain open until 24 October.