The eruption of the Grimsvotn volcano sends thousands of tonnes of volcanic ash into the sky on May 23 above Iceland. The cloud has forced the closure of Icelandic airspace and spread fears of a repeat of the global travel chaos that was caused by last year's Icelandic eruption, although authorities insist that this Grimsvotn poses a lesser threat.
Ash clouds creep toward Scandinavia, Europe
By Rich Shulman
This looks a bit like a tornado, but it's a low angle view of the volcanic ash cloud. Full story.