European air traffic from Scotland to Scandinavia and the Netherlands was disrupted by volcanic ash spreading from Iceland, shutting airports and prompting British Airways to suspend all domestic flights. Aberdeen, Edinburgh and Glasgow airports were closed on advice from British air traffic control, and all London airports were likely to shut down at midday, according to airport operator BA Ltd. Oslo closed its Gardamoen airport outside the Norwegian capital and Amsterdam's Schiphol airport canceled dozens of flights. 'Volcanic ash represents a significant safety threat to aircraft,' Taylor Samuelson, a spokeswoman for the British National Air Traffic Services, said in a statement. The number of flights allowed to enter British airspace had been limited because of the cloud of ash, she said. The volcanic eruption in Iceland is the second in four weeks and prompted the evacuation of the nearby area by more than 800 people as water levels in rivers rose by almost three feet. Iceland straddles mid-Atlantic tectonic plates, making the island of about 300,000 residents geologically active. Volcanic ash can disrupt flights because of the potential risk of engine malfunction and impairment of cabin air quality. 