sky news now running the story:
"The latest information we have is that some of the denser volcanic ash, that's the no-fly zone, is over the Donegal area," IAA's chief executive Eamon Brennan told RTE radio.
"We are concerned about the north-easterly winds moving this down over the rest of the country."
He went on: "At the moment we have a slither of denser ash over the midlands and if this continues for the next number of hours we have no option, based on the new regime imposed in Europe last week, except to impose a no-fly zone and a 60-mile buffer zone which would effectively close Shannon and Dublin airports."