New eruptions in Iceland's Bardarbunga volcano system prompted authorities to raise the warning level for the risk of ash to aviation to the highest level of red.
The area has been hit by thousands of earthquakes over the last two weeks and scientists have been on high alert.
In 2010, an ash cloud from the Eyjafjallajokull volcano, in a different region of Iceland, closed much of Europe's air space for six days.
More top news
Amber Rudd feels the heat and a summer visit for Donald Trump raises fears of unrest.
Experts called on the Government to immediately tighten up fire regulations without waiting for the conclusion of the Grenfell inquiry.
Tottenham Hotspur is one of the first clubs to declare its commitment to phasing out single-use plastics at its new stadium.