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A ban on flights to and from Scottish airports has been reinstated over fears of the danger to aircraft from a cloud of volcanic ash.All non-emergency air traffic was grounded on Thursday because of the dust cloud created by a volcanic eruption in Iceland.
Restrictions were lifted in Scotland as the cloud moved south on Friday.
However, air traffic control body Nats has now closed all UK airspace until at least 1900 BST.
In a statement, Nats said: "Following the latest information from the Met Office, Nats advises that restrictions across UK controlled airspace have been extended until at least 1900 BST and that restrictions to Scottish and Manchester airspace have been reapplied until the same time.
"Current forecasts show that the situation is worsening throughout Saturday. "We are continuing to look for windows of opportunity to handle individual flights in UK-controlled airspace."
A further update is due from Nats at 0900 BST.
On Friday, Ryanair cancelled all its flights over northern Europe for the whole weekend.
A small number of flights departed and arrived at Glasgow airport on Friday, including two Icelandair flights carrying more than 400 people who were stranded after the volcano erupted in Iceland.
Among the passengers was a school group from Loughborough in Leicestershire, who were in Iceland for a geography field trip.
One of the teachers photographed the plume of ash breaking through the clouds as they flew back to Scotland.
Loganair said a limited number of flights, including those between Glasgow and Stornoway, Islay, Benbecula and Barra, started operating on Friday afternoon following advice that flight routes used by these services were clear of volcanic ash.
The Scottish Environment Protection Agency said it was examining particles of the ash which had been found in Scotland.
Peter Sloss from the Met Office said people could start to see dust on their cars by Saturday.
"As the winds begin to ease down the heavier particles start to fall," he said.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.