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Volcanic ash ingested in an engine can cause an engine to shut down; plus the visibility problems are obvious.

Eruption of the Icelandic volcano Eyjafjoll sent an ash plume into the sky threatening aviation safety.

Curtailed: Amsterdam, Brussels; various locations in Norway, Sweden and Finland; German airports north of Frankfurt/Main.

Airports are shutting down due to the threat: Belfast, Glasgow, Edinburgh, Aberdeen, Birmingham, Manchester,Heathrow, Gatwick, Luton, Stansted;

View Volcanic Ash Map in a larger map