Deenihan on his way to US to support families
Minister for the diaspora Jimmy Deenihan was due in San Francisco early today to represent the State in support of the bereaved families and those injured in Berkeley.
Officials said Mr Deenihan's presence was "a gesture of solidarity" to support everyone stricken by the tragedy. One official said it was important that the citizens of Ireland were represented.
Politicians of all parties will unite in prayer for the dead, the injured and their families next week at a special ecumenical prayer service.
Details of this were still being worked on last night.
The special ecumenical prayer service is expected to be held in a nearby church early next week facilitated by a short break in political business.
After a special Dáil adjournment on Wednesday, as a mark of respect, normal business resumed at Leinster House yesterday.
British Prime Minister David Cameron also expressed his sympathy.
At a joint press conference held after meeting Taoiseach, Enda Kenny in Downing Street, Mr Cameron prefaced his remarks by expressing sympathy to relatives and friends of those who had died or had been injured in the accident.
Health Minister Leo Varadkar said what happened in Berkeley on Tuesday was a "national tragedy".
He said almost everyone in the country had been touched by the Berkeley deaths in some way.
Mr Varadkar said one of his constituents is among the injured. He was speaking as hundreds of people queued to sign books of condolence in the Mansion House.
The Mayor of Galway also opened a book of condolence, the Cork city authorities opened one at City Hall.
University College Dublin has an online book of condolence, and Dún Laoghaire-Rathdown County Council also has an online condolence book at dlrcoco.ie.