Around 400,000 commuters face travel disruption as Dublin Bus drivers hold a fourth day of strike action.
No Dublin Bus routes, sightseeing tours or Airlink services will operate today, while Nitelink buses will not run on either Friday night or Saturday morning.
Another 48-hour stoppage is scheduled for next week, in addition to the 13 further days of strike action announced yesterday by SIPTU.
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Taoiseach Enda Kenny will join EU leaders in Bratislava this morning for a meeting of heads of state.
The special "informal" summit has been called to discuss the future of the bloc after the Brexit vote and the reforms it must undertake to survive today's challenges.
A future deal with the UK, which has not been invited to the talks, is not expected to be discussed until Britain has formally triggered divorce proceedings under article 50.
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Meanwhile, Mr Kenny and opposition leaders have agreed in principle to a statutory inquiry into NAMA's sale of Project Eagle.
It comes after a Comptroller and Auditor General report concluded that the taxpayer probably lost €220m on the sale of the Northern Ireland loan book.
Cabinet yesterday decided that further investigation was necessary, but stopped short on deciding what form it should take.
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US presidential candidate Hillary Clinton has insisted she is "doing great" after a health scare.
However, following her recovery from pneumonia, the Democratic nominee faced a series of questions about her illness on her return to the campaign trail.
The 68-year-old former secretary of state said "sitting at home was pretty much the last place" she had wanted to be, but that the short break had allowed her to reflect on the campaign.
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Over 3,000 events are taking place in museums, galleries and churches around the country for Culture Night this Friday.
Now in its 11th year, the annual extravaganza will allow people in 40 Irish towns and cities to become a tourist in their own back garden.
The festival of culture has grown from attracting around 40,000 attendees in 2006 to over 370,000 last year.
