Eyjafjallajokull, a volcano in Iceland, had a massive eruption on Wednesday. Ash is now spreading over Europe, shutting down nearly all air traffic, since volcanic ash is dangerous to aircraft engines.
Millions of passengers have been stranded in Europe and the United States, since trans-continental flights have been shut down.
Here are some pictures and video of the volcano and eruption.
The last time Eyjafjallajokul erupted was from December 1821 to January 1823, so this episode may well last for some time. The mountain is covered with a glacial icecap; the April 14th blast came from underneath two hundred meters of ice.