We just got the news (via Relix) that Neil Young and Crazy Horse posted a message on their website today saying that they have to cancel their upcoming European tour dates due to an accident.

August 8, 2013
For immediate release:
Due to an accident involving Crazy Horse, the remaining dates on the Neil Young and Crazy Horse tour of Europe and the British isles have been cancelled. We are sorry for any inconvenience this causes to our fans or the Festivals where we were scheduled to appear. As you must be, we too are disappointed at this unfortunate turn of events.
— Neil Young and Crazy Horse

This was posted on their tour dates page:

neil young european tour dates

Neil Young Times [www]

UPDATE: Rolling Stone posted that the guitarist broke his hand; phew, false alarm. But a bummer for Crazy Horse fans in Europe:

Neil Young and Crazy Horse have canceled the final seven dates of their European tour because guitarist Frank “Poncho” Sampedro broke his hand. “It’s a mild fracture,” a source close to the Young camp tells Rolling Stone. “He’s expected to make a complete recovery in time for the North American tour.” The group has been on tour for much of the past year, and they played yesterday in Oslo, Norway.