Those hoping that yesterday's closure of airports in Ireland and parts of Scotland would only be a one-day affair were disappointed when the ash cloud from the Icelandic volcano Eyjafjallajökull came back with renewed strength.

Glasgow, Edinburgh, Belfast, Dublin, and numerous smaller airports have closed, and the Civil Aviation Authority says northern England may also be affected. Officials added that airports further south, such as Heathrow and Gatwick, will probably escape for now.

Airplanes are not only forbidden to fly through thick concentrations of volcanic ash, but must also stay more than 60 nautical miles (69 terrestrial miles) away from them.

Officials say the ash will be thickest over Northern Ireland, the Republic of Ireland, and western Scotland all of today.

The last time Eyjafjallajökull erupted was 1821, when it ejected clouds of ash on and off for more than a year.

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