MEMRI HAS AN ANALYSIS casting doubt on the authenticity of the letter taking “credit” for the Madrid bombings on behalf of Al Qaeda. Several readers have suggested that ETA might have good reasons to deny responsibility publicly. I have no idea, but it’s a lot easier to take credit for doing things than it is to actually do them.

UPDATE: On the other hand Jeff Jarvis has reports that Islamists are behind the bombings. (The same ones who sent the letter? Or different one? Beats me). As always, early reports tend to be wrong, so stay tuned.