Iceland will close two airports on Friday for the first time, a week after ash from an Icelandic volcano forced the shutdown of airspace over much of Europe and stranded thousands of passengers around the world, the Icelandic aviation authority announced.

The Keflavik International Airport and Reykjavík International Airport will be closed beginning early Friday morning, the aviation authority said, according to a statement on the Keflavik airport's website.

Though the ash cloud originated in Iceland, the country's airports have been spared from closure until now. Strong northwest winds had been blowing ash from the volcano, in the south of Iceland, out to sea and over Europe.

Elsewhere in Europe, most airports appeared to be open on Thursday and are expected to be open Friday.

That reduction in volcanic activity appeared to be the main reason that flights resumed operating in Europe on Wednesday, along with European countries relaxing their restrictions on flight, according to a spokeswoman for Eurocontrol, an intergovernmental body that manages European air travel.